Thanks!
This book explains a lot about the history of naming in Germany:
Wilfried Seibicke: Die Personennamen im Deutschen. Eine Einführung. (for those, who know german).
Also, quite a few of the non-biblical names you mentioned have a christian background via meaning (
Dominick,
Benedicta) or saints/legends (
Melchior,
Martin,
Catharina,
Albert ...).
My own family doesn't trace as far back as yours, but the oldest names are mainly christian (versions of
John,
Catherine,
Eve and
Elizabeth). The 3 most popular names in my family tree are versions of
Anna,
John and
Elizabeth.
I found a non-representative list of the 49 most popular
German women's names from the late Middle Ages:
10 of them were biblical, 2 were non-Christian, I couldn't find out the origin of 5 of them (presumably short forms, they are sometimes difficult to assign) and the remaining 32 names had a
Christian background, e.g. saints.
https://www.beliebte-vornamen.de/1701-1495-w.htm
I guess, it's just a different sense of naming tradition.
In European countries, other biblical names have a longer tradition than in the USA or UK.