My first name! (hence: ryano). The existance of such a name is a product of the American habit of preserving ancestral surnames as first names e.g. Macauley Culkin.
My parents were living in the USA when I was born, and decided to call me Ryan because that was my mother's maiden name. Back in Ireland, however, the name was very uncommon. I didn't meet another person called Ryan until I was 14. It has now become more common, and there are lots of younger folk with the name.
The surname Ryan is very common is Ireland, and indeed throughout the world. It originates in Tipperary, and is a form of "Mulrian" (I think there are still Mulryans out there). It does indeed mean "king" or "little king".