Ellar Coltrane, the star of Richard Linklater's acclaimed 2014 movie "Boyhood," is an outlier, namewise. Most others with his first name are girls, and there aren't even many of them -- the last time the Social Security Administration registered the name at all was in 1956, when six girls were named Ellar. Still, with Gaelic names being trendy, and the "El-" sound on the rise, it has some potential.