I have not found additional information .
Can you confirm that after the war the family Louis/Coorengel leaved Ned Indien and gone back to the Netherlands? If they came back yo can order a so-called -persoonskaart- by CBG.
(www.cbg.nl, on the homepage choose left column research and then personal records).
I could not find the birth of Willem Alexander Louis.
I found the dates you already published
14-09-1872 Soerabaja birth Johan Barend Louis
21-08-1907 Koeta Radja marriage of Johan Barend Louis with Sinein (baptised name Maria)
04-10-1901 Cheribon Mathilda Bernardine Coorengel
06-05-1922 Weltevreden marriage of Willem Alexander Louis with Mathilda Bernardina Coorengel.
Was Victor Alexander Louis a brother of Willem Alexander? He died during the war.
regards,
Ben