I've wondered about this, too. Not because I thought Cohan was Jewish -- in fact I knew George M. was Irish -- but because to an American the name doesn't really seem Irish at all, does it? I looked on the Web, and here's what I found:
Cohan is a simplified form of the Irish surname Keohane, changed to approximate the way the name is pronounced. The Irish would pronounce both of them as "Co-HAN," but it's easy to see that most Americans would say it "KEE-oh-hane" if the real name weren't stripped down.
There’s a funny remark in a Web blog at http://crookedtimber.org/2007/07/16/apocrypha-now-ii-the-revenge-of-samuel-pepys/ to the effect that the blogger, who had been trying to get accepted for graduate study at Duke University, talked by phone to a professor named Robert Keohane. But even though he had been told the name was pronounced “Ko-hane,” [and I would have told him "Co-han"] he kept calling the man “Professor Kee-oh-hane.” He didn’t get into Duke.
To go back a bit further, Keohane is an Anglicized form of the Gaelic surname Mac Eocháin, or “son of Eochán” – which in turn is derived from the personal name Eochaidh. One Web source said you can trace this last mentioned name back to the old Irish word for horse.
Then to bring it back to George M. Cohan, some members of the Keohane family have a message board on ancestry.com, at
http://boards.ancestry.myfamily.com/surnames.keohane/19.24.1/mb.ashx#
One of them found, on another Web page that is no longer live, a write-up specifically about George M. Cohan’s father Jeremiah Cohan, who was the son of Michael Keohane. Here’s some of the text pertinent to the Irish part of this:
“Jeremiah Cohan was born on Blackstone Street in Boston on January 31, 1848, the son of Michael Keohane and Jane Scott, both emigrants from County Cork. He started with a trade, working as a saddle and harness maker and also serving as a Surgeon's orderly during the Civil War. But he was particularly fond of Irish dances he learned as a youngster, and he eventually developed an act, performing Irish steps and also playing the fiddle and the harp. He began touring with minstrel shows, and met his wife, Nellie Costigan of Providence, Rhode Island. They married in 1874 and went on the road together. They formed a Hibernicon, described as "a form of Irish vaudeville featuring songs, dances and rapid fire sketches." For a time Patsy Touhey the piper traveled with the troupe in 1886-87.”
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