I know quite a few Iarlaith and they all spell it Iarlaith and pronounce it Ear-la. I like Iarlaith because it is a very Irish name and I love Irish names but I don't like Jarlath.
-- Anonymous User 12/21/2008
I think Iarfhlaith sounds too much like Órfhlaith (Orla) and thus feminine. I love Jarlath though.