A 5th-8th cousin DNA match means, that you have a common ancestor, who was born somewhere in the 19th or 20th century (depending on your and his birth year).
So with this Engeltje van der Wal you are definitely on the wrong track.
Jan, with a 5th cousin one shares 2/64 ancestors, with an 8th cousin 2/512 ancestors, so 18th century is very well possible.
(5th cousin is 12e graad, not 5e graad).
1st cousin (full), same grandparents, 2/4 ancestors.
2nd cousin, same ggrandparents, 2/8 ancestors.
3d cousin, same gg-grandparents, 2/16 ancestors.
I do have the Van de Wal family from Nieuwaal in my tree, though I don't know these names.
If you and that person have more ancestors from that geographic area "between the rivers", you have to keep in mind that these people were related to each other in numerous ways.