I'm not sure it's because of Twilight-- it's been slowly on the rise for a while now; it fits into that "old guy chic" category like
Oliver,
Oscar and
Felix. I don't think it will ever be gigantically popular, but Twilight may propel it out of the realm of hipsterish names (I don't think
Oscar will ever make the leap) into the semi-mainstream. Watch it be #1 next year-- I'm lousy at making predictions! For the record, I have always loved
Jasper!