Yes, it is. It could be a nice name for both girls and boys, although I've seen it mostly in boys. Although, you could stick with unique alternative spellings for girls such as "Rylee," or "Rylie", but I really think that the "Y's" make it more feminine.
not really but if you like that name its fine but popular names are like Jacob Riley
Win Riley's birth name is Winston Riley.
Riley is an Irish name.
Riley Schmidt's birth name is Christopher Riley Schmidt.
Amber Riley's birth name is Amber Patrice Riley.
Chad Riley's birth name is Chad Christopher Riley.
Chester Riley's birth name is Donnell Chester Riley.
Holly Riley's birth name is Holly Rae Riley.
Kaitlin Riley's birth name is Kaitlin Ann Riley.
Sally Riley's birth name is Sally Michelle Riley.
Victor Riley's birth name is Victor Allan Riley.
Riley DeLuise's birth name is Riley DeStefano DeLuise.