Mmmm didn't think about the Vauxhall connection. Don't really want her growing up thinking that she was conceived in the back of one! Having said that, I quite like the fact that it is (currently!) quite unusual as I haven't seen it crop up on MN before?
Vauxhall here, too, sorry. Can't imagine there will be swarms of them named after the film, for that reason. Am sure a film buff DH could come up with something better than that - there must be tons of great names that give a nod to a cool film without having any unfortunate connotations.
I know someone with a Merida - she is named after the town in Mexico where she met her husband. Not sure how happy she is with Disney Pixar right now. She pronouces it like Meredith except with an a on the end instead of the ith iyswim.
It sounds like an antibiotic to me. I doubt that there will be hordes of Merida's after the film comes out. I have been a Pixar expert in the past. DD wanted to be called Ariel after the mermaid (not strictly Pixar I know)