[jesselt]

I'm probably wrong, but I'm going to take a guess and say that it doesn't really mean anything in Japanese >_>

The first character is 生 which means a number of different things and the following two are 六 and 三 which are six and three, but not sixty three.

I ran a google search and it didn't turn up anything except on Chinese sites. Wait for a native speaker or someone who is more knowledgeable than me though.

Edit: Whoops, MMM beat me =(