The "H" stands for ... ?

when the girls and i went on our little weekend get-away, we had many an odd conversation. the one that sticks with me, and that i don't remember the resolution to, is this:

What does the "H" in "Jesus H Christ" stand for?

my excuse for not remembering is that there was wine, and cookies, and a hot tub involved. and i'll just leave it at that. ;-)

so, tell me, what does the "H" stand for? bonus points for creative use of genealogy or etymology or other "-ologies" that may or may not apply.