Rilly is the name of one of my horses (my first horse). When she was born we could never pick a name we just always called her Rose's Filly (her mom was Rose) which after a while somehow just got condensed to Rilly. It is pronounced filly but with an R. Everyone thinks Riley. 10 is my lucky number, always wore it on every team I played on in school, was born 5/10 and grew up on 10th St.