It reminds me of a Seinfeld episode:"Seven Costanza... You're serious?"
"Yeah. It's a beautiful name for a boy or a girl. Especially a girl... Or a boy."
"I don't think so."
"What, you don't like the name?"
"It's not a name. It's a number."
"I know. It's Mickey Mantle's number. So not only is it an all-around beautiful name, it is also a living tribute."
- George and Susan
"Seven? Yeah, I guess I could see it. Seven. Seven periods of school, seven beatings a day. Roughly seven stitches a beating, and eventually seven years to life. Yeah, you're doing that child quite a service."
- Jerry,
"I defy you to come up with a better name than Seven."
"Alright, let's see... How about Mug? Mug Costanza. That's original. Or Ketchup. Pretty name for a girl."
"Alright... You having a good time now?"
"I've got fifty right here in the cupboard... How about Bisquick? Pimento? Gherkin? Sauce? Maxwell House?"
"Alright already!!"
- George and Jerry
In the United States, the only limitations on naming is that you can't name a child a number. However, you can name a child a number if you spell it out. For example, Seven is OK, 7 is not. Six-six-six is just dandy, but 666 is right out!
Strangely, in 2010, there were 68 boys named Seven (as well as 18 Sevins, 10 Sevyns, 9 Sevons and 6 Sevans). the 6 Sevans may be Armenians with a different name, but I'm pretty sure at least Sevin and Sevyn are alternate spellings of Seven! It appears to be falling in popularity, though-- in 2009 there were 83 Sevens (+16 Sevins, 12 Sevons, 10 Sevans and 7 Sevyns).