A while ago someone asked me what I thought of Robin for a little girl's name, so I looked into how popular it was, and I was shocked that there were only 143 baby girls named Robin in 2011. Robin, the name of the bird (my state bird), is one of the truly unisex names out there. Some may see it better on girls or boys, but this one has no rules, just like Sage and Rowan. However, back in the day it was used as a pet form of Robert (most will remember Robin Hood immediately, or Batman & Robin, although this name has been used by William Shakespeare as well) and it was Germanic, meaning "bright fame." In this case, it could still work very well for boys named Robert (for parents who do not like the nickname Robby/Rob). For girls, it has not ranked since 2004, a decline from it's highest ranking at #25 in 1962 and 1963, always ranking since 1932. For boys, it has ranked since 1881, it's highest ranking being at #143 in 1956, then falling off the charts in 1999. Overall, more popular for girls in modern times. Robinet/Robinette and Robina are two rarely heard female variations.
Looking for a different bird name? Perhaps Birdie, Feather, Wren, Lark, Nightingale, Cardinal, Oriole, Dove, Linnet, Swan, Finch, Heron, Starling, Kestrel or Weaver?
Here's a fun fact: actor Robin Williams named his daughter Zelda after the video game.