Did your ancestors come to the US through Ellis Island (1892-1925)?
There are more than 1100 listings for GLYNN in the Ellis Island database. Click on the link below and see what it offers you.
What has been written about the "Surname"?
Check out MacLysaght's link.
Ancestors from Ireland?
Check the link below for "GLYNN" Households in Griffiths Valuations"
Of the 603 "GLYNN" households recorded in Griffiths , about half (299) were found in County Galway. It is by far the largest number. Mayo recorded 55; Roscommon had 45; Clare had 43; and Westmeath had 34. None of the remaining counties had as many as 20.
(Thanks to Anne Adams for the GLYNN Households listed in the GRIFFITH'S INDEX for all of Ireland.)