I gotta say Kevin.
Sorry to all Kevins, but as a German married to an Aussie, this name is tough. To my husband it's a completely normal boys' name, and when we discussed names for our firstborn, I had to explain to him that "Kevin" is completely off the charts because in Germany it's used as an insult.
I think I've heard of scientific studies that have proven that teachers expect less from a boy who's called Kevin, compared to other boys' names. Prejudice is strong about that one. There's a couple of others, but Kevin's like the "godfather of unusable names" in Germany.