Origin of John Kerry's last name

[Gerald Cohen]

This is to ans-l and ads-l:
    A recent issue of the German magazine Spiegel (1 March 2004, p.
109) tells how John Kerry's grandfather came to have the last name
Kerry. The story probably appears in John Kerry's autobiography:

(translation): "In contrast [to the blueblood origin of the mother's
side of the family], the Kerrys have a prosaic family tree. The
grandfather of the little JFK [i.e, John Forbes Kerry, vs. President
JFK] was actually named Fritz Kohn and was a Jew from Bohemia.
Before his emigration in 1904, he looked over a map, selected a new
name based on the Irish county Kerry and converted to Catholicism."

Gerald Cohen
P.S. I suppose that grandfather Kohn was influenced in his choice of
Kerry (county) by the presence of initial K in both names.