He started to guffaw at my question. Turns out that I'd mispronounced the name. Apparently, the baby shares the name with some very famous fellow named "Bob Dylan" (don't start: I don't keep up with all the singer celebrities) and so I should have known how to pronounce the name.
Google to the rescue. Plug in "pronounce dylan" and the first site that comes up carries a rather plaintive question:
Also, How in the world does one pronounce Dylan?
The next post in the thread (this was in a newsgroup, precursor to blogs) carries the answer:
But shouldn't there be two ells then? But then, the post is on a programming newsgroup. Maybe it's a techie thing to have doubts on how to pronounce the name -- we are, perhaps, too pedantic.
Anyway, I located the Wikipedia entry for Bob Dylan and added the pronunciation. Maybe I should do the same thing for Dylan Thomas (who I'd always thought was pronounced Die-lan Thomas) but I'm not sure if the Dill-an pronunciation is something that this Bob Dylan character originated when he changed his name from Zimmerman.