I really like the name, and I like the Gaelic spelling. I would echo the rest of Jeff's thought though. Even my own last name requires explanation every time I give it. My standard comment is, "Two Ls, like a hitman." It's worth the trouble in my opionon, and I am glad my kids (who are grown now) don't have trendy names; there must have been 4 Jasons in every class they ever had.

My own children have biblical names as well: Gabriel and Elizabeth followed by family names.