We discussed this on the Ave Q board. Some theories:
"When some japenese people come to america they want to change there name. They want it to sound more american. Many will take famous actors or actress' names.
I'm guessing they're using a traditonal american holiday to make it more funny"
"i think it's because japanese names always have this "resounding" meaning, if i can say, like "akiko" (i think) it's "light child", arashi "son of the storm" and stuff. So they decided to call her "Christmas Eve" to kid around with that"
"...if you rearrange the letters in the word unemployed, it spells OPPORTUNITY!"
- Gary Coleman, Ave. Q