Sir William Thayer, Jr

Not proven as father of John Thayer, Sr.

Search here for Wilhelmus Tayers

https://books.google.com/books?id=aicwAAAAYAAJ&vq=Wilhelmus&pg=PA19...

here is what the Thayer Family Association has on their web page:

https://thayerfamilies.org/cpage.php?pt=5

VOLUME I ‹ The Thayer - Tayer - Theyer Families of Gloucestershire England 1500-1660

This first volume consists of the genealogical information on 306 individuals who resided in Gloucester county in England, including the earliest known Thayer Ancestor, John Tayer (1500-1561/1562) through to his Great grandsons, the brothers Thomas and Richard Thayer; and his Great Great Grandson, Nathaniel Thayer, all of whom immigrated to America in the mid 1600's and settled in Massachusetts. ....