Name Dilemma

What do you do when you have a name picked out for your child and then you find out (6 weeks before you are due) that a childhood friend of your husband's named his child the same thing? The kid is about 18 months old and we just met him for the first time last weekend and learned his name. Brett's brother is really good friends with this kid's dad and Brett has known him a long time. Do we still name him the name or do we change it? We have been calling him it the whole pregnancy almost.