I don't mean to be picking on you, it's just that once again I have to correct you on the pronunciation. I've never met a Hillel who pronounced his name Hi-lel. In my esperience it's always been Hill-el.A famous bearer of this name would of course be the Biblical commentator and sage Hillel who founded the school of knowlege know as Bet Hillel (literally The House of Hillel). One of his more famous quotes is the extremely wise "If I am not for myself, who will be? If I'm only for myself, who am I? And if not now, when?"
In addition to my previous comment:The name is spelt הִלֵּל. Hi-le-l, with the second vowel (the E) clearly attached to the first L. Hill-el would be more like חִלאֵל.