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Forum logoOnderzoek in Nederland » Good news: DNA confirms Joost Cornelisz Barnhoorn was the son of Kornelis Joosten Barnhoorn and Trijn Jeroen Joosten (17th century Noordwijk)



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Dear forum members,

After many years of wondering and hoping, the Y-DNA results are in — and they confirm what I always suspected: Joost Cornelisz Barnhoorn (baptised 15 May 1685 in Noordwijk, illegitimate son of Trijn Jeroens) was indeed the son of Kornelis / Cornelis Joosten Barnhoorn and Trijn Jeroen Joosten.

This closes a long-standing question that goes back to the very first thread here in 2010 ("Joost Barnhoorn" – started by C.G. Barnhoorn and continued by many of you). Huge thanks and kudos especially to Frans Angevaare, who on 22 November 2012, located and shared the baptism record of Joost in this forum — that was the crucial breakthrough that pointed us in the right direction.

Special gratitude also goes to Dick Barnhoorn, who created and maintains the WikiTree pages on the Barnhoorn family lines. Dick posted the Y-DNA results there once they came back positive, and we now share the same direct paternal ancestor: Joost Teeuwisz Barnhoorn (father of Kornelis Joosten).

Current paternal-line Y-DNA test-takers (both haplogroup I-M170):

  • Dick Barnhoorn – FamilyTreeDNA 37 markers, kit #IN124760
  • Steve Barnhoorn – FamilyTreeDNA 37 markers, kit #1034763

Dick’s research note on WikiTree (before my results) said it perfectly:

"When Joost was baptised, the name of his father was not known. Under some pressure his mother claimed the father was 'Cees Loodheen'. No person with the name Loodheen has been found. [...] We have concluded that the most probable father of Joost is Kornelis Joosten van Barnhoorn, the only Cornelis Barnhoorn having the right age. Y-DNA tests are necessary to confirm..."

The tests are in, and they confirm it.

In May 1981, my late father visited the Noord-Holland Archief in Haarlem and began tracing the Barnhoorn line, but it ended with Joseph Barnhoorn (1824–1889), as we later discovered. In August 1990, I was bitten by the genealogy bug and picked up where my Dad left off. With help from relatives, the line was traced back to Joost Cornelisz Barnhoorn in 1992. There was no further information on his origins until Frans found Joost’s baptism record and the names Cees Loodheen and Trijn Jeroen Joosten as his parents. Over the years, I have been researching this line, always hoping to identify Joost’s father. With encouragement from both Dick and Frans, I finally took the chance — and the results came back exactly as I had always believed deep down.

There are still a few scattered records mentioning Kornelis Joosten Barnhoorn (he left some traces behind), but this DNA match is the strongest proof we could ask for.

If only my late father — born in Haarlem in 1930 — could see this now. He passed away in 1996, without knowing the answer, but I know he would be so happy and proud. I like to think he’s smiling down from Heaven, finally at peace with the mystery solved after all these years of searching.

Thank you all for the years of discussion, tips, and encouragement in this thread and others. It means more than I can say.

Warm regards,

Steve Barnhoorn

Steve Barnhoorn 2 - 13 feb 2026 - 01:40 (laatst bijgewerkt 13 feb 2026 — 01:41 door auteur)

Congratulations Steve on the new found results and I am very happy for you that you found the answer to this long standing question.
And it is interesting to read how the process was from posing the question to finding the answer.

I myself started testing with FTDNA last year. It turns out I have a pretty rare haplogroup with lots of private mutations and no matches at all at FTDNA. I am in the process of having family members doing the Big Y-700 test and I hope to come to a haplo-group that has a more recent date for the common ancestor of us. Hopefully that will help me to sort out the canundrum I have and that the paper trail so far can't solve.

Michaël

Boers 2 - 13 feb 2026 - 07:40

Dear Michaël,

Thank you so much for your kind congratulations — it truly means a lot to me! I’m very happy that the puzzle finally fits together after all these years, and I appreciate that you found the process interesting.

Regarding your own Y-DNA journey: congratulations on starting with FTDNA! A rare haplogroup with many private mutations and no matches yet is certainly challenging, but also full of potential. The Big Y-700 tests with family members are a great step — I sincerely hope they bring you a more recent TMRCA and help resolve your conundrum. Wishing you every success with the tests and analysis!

As for sharing this Barnhoorn breakthrough more widely: I’m seriously considering documenting it in a more formal way so that other (distant) descendants of Joost — and future ones — can benefit from the research. I’m thinking of a short submission to Ons Voorgeslacht (via Hogenda), and perhaps also filing a summary with the Centraal Bureau voor Genealogie. This would preserve the evidence (baptism record, DNA confirmation) and give credit to the collaborative spirit here on the forum — Frans Angevaare’s 2012 discovery, Dick Barnhoorn’s WikiTree work, and the encouragement from you and others. Without that shared effort over the years, this wouldn’t have happened.

I’d be very interested in your thoughts: do you have any experience or advice on submitting to Ons Voorgeslacht or the CBG? Any pointers would be most welcome!

Once again, thank you for your message — and best of luck with your own search. I hope you get that breakthrough soon!

Warm regards,

Steve

Steve Barnhoorn 2 - 13 feb 2026 - 15:31

Hi Steve,

Both CBG and Ons Voorgeslacht/Hogenda are perfect ideas. I recently have uploaded several lineages and two pedigree charts myself to Hogenda. Just make sure that you include source citations for every bit of info. Even for BMD-data. In a printed publication that is excluded to preserve column inches, but with electronic documents that argument doesn't hold anymore and it is much more helpful for readers to retrace the steps.

I received a lot of extra questions when I sent in my contributions to Hogenda, so to prevent that acompany your document with the following information:

Title of the document as it should be listed in Hogenda.
Earliest and latest date covered by the document.
Most important geographical locations mentioned in the document (max 4 locations).
Most important last names covered by the document (max 4 names).
Date of publication.
Name of author.

I believe Ons Voorgeslacht is now adding these publishing requirements to the website.
I am in the process of publsihing my first article in the Ons Voorgeslacht journal myself. It will take another while in preparation, though.

I have no experience with publishing with the CBG. I would send them an e-mail with that question.
It helps if there is already a family dossier: https://cbg.nl/bronnen/familiedossier/ and service@cbg.nl
If not they may create one for you. I just have no experience with this process myself.
Beware that they are in the middle of upgrading their website to a new one, so the website looks different every day that you visit it.

I looked to the Barnhoorn Wikitree pages this morning and to my astonishment I found a typo in the marriage year of Pieter Lourisz. van Barsingerhorn and Jaepgen Frantsendr.: it states the year 1980, which -I assume- should be 1580.
I have sent Dick a Wikitree message.

Once again: congratulations,

Michaël

Boers 2 - 13 feb 2026 - 19:23

Hi Steve

Once again congratulations (this time publicly) for this connection you found through DNA testing.
It's of course a very important piece of the puzzle which I know you have been searching for many years now.
Good work!

Regards, Frans

Frans Angevaare - 13 feb 2026 - 21:31

Congrats! Just wondering though, Joost was illegitimate, but did get the patronym and surname of his biological father?? How did that happen?

Marije Essink - 14 feb 2026 - 14:37

That’s a very good question.  

The short answer is that no marriage record has ever been found for Trijn Jeroen Joosten (Joost’s mother). In fact, she appears to have had a relationship with another man prior to Joost’s baptism, but again—no marriage record turns up despite extensive searching.

Kornelis Joosten Barnhoorn (or van Barnhoorn) later married another woman after Joost was born, which is consistent with the timeline.

Apart from his baptism in 1685, Joost’s surname first appeared in a 1707 court record (and one other occasion). His patronym “Corneliszn” shows up in both marriage and RK church records, which aligns with “Cees” (short for Cornelis) being listed as the father in the baptism entry. Unfortunately, no court case exists from Joost’s childhood or directly tied to his birth circumstances.

Frans Angevaare delved deeply into this on the forum and in private email exchanges years ago—I am sure he may have more to add.

I’m away from home right now, so I don’t have my full notes or the reports Frans kindly generated for me, but I believe this covers the key points. Hopefully that helps answer your question.

Thanks again for the kind congratulations. As Frans pointed out back in 2010 (and in the thread that started then), I spent years trying to resolve Joost’s paternity. I’m just happy the DNA results finally confirmed what the records had long suggested.

Warm regards,

Steve
 

Steve Barnhoorn 2 - 14 feb 2026 - 17:19 (laatst bijgewerkt 16 feb 2026 — 02:47 door auteur)

Yes, that's right Steve, the first time the surname Barnhoorn popped up in connection with Joost is in the Noordwijk notarial records from 1707, in which Joost Cornelisz Barnhoorn was pointed out as the father of Jan Joosten Barnhoorn (thus, also with a surname). 
As to the question of how Joost came to the patronym and surname of his father: Steve already pointed out that is mother was pressed to admit the father's name, so use of the patronym Corneliszoon is logical.
For the surname you have to realise that, while we have been searching for years for the connection, in the small community of Noordwijk-Binnen of around 1700 it was no secret at all. I guess most people living there knew that Cornelis Joosten Barnhoorn was the father of Joost and so he was called Barnhoorn too by the people of Noordwijk.

Joost, by the way, was in 1707 very surprised that Aagje Maartensdr pointed him out as being the father of the child of which she was in labour. When confronted by the midwife Joost replied with great dismay that he had indeed had dealings with her but did not think that a child would result  (translation by google).

Regards, Frans

Frans Angevaare - 14 feb 2026 - 21:57 (laatst bijgewerkt 14 feb 2026 — 21:57 door auteur)


Congrats from me as well. I guess we are now officially distant relatives. I decend from Jacobus "Koos" Passchier (1869-1944) en Maria Barnhoorn (1868-1937); I am a great grand son of that couple. (This is a pedegree branch which I have not researched myself). The lineage couples to the Barnhoorn wikitree here and here

-Bart- - 25 feb 2026 - 20:07







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