William Barclay Squire,
Dictionary of National Biography…
(1886)
“ BYRD, WILLIAM (1538?–1623) , musical composer, is generally supposed to have been the son of Thomas Byrd, a gentleman in the Chapel Royal under Edward VI and Mary. This statement is pure conjecture; there were several families who bore the same name at this period. The only evidence corroborative of it is that William Byrd's second son was named Thomas, possibly after his grandfather. ”
