Felix is one of my top favorites! I agree that
Felix Ezra and
Felix Luca are a bit incomplete looking, and the flow is kind of off in
Felix Luca I think. I like
Felix with something a bit longer. I also think it goes well with -us or -os names.
Felix Theodore was one of my own combos.
Here are some more:
Felix AugustusFelix RobertFelix EmmanuelFelix Rudolph (I love this so much, but it sounds so much like a Nazi it's a GP combo for me)
Felix LeopoldFelix Sylvester (dropped this because of cats)
Felix TiberiusFelix ZacchaeusFelix TobiasFelix AlexanderFelix DemetriusFelix BartholomewFelix PascalFelix SebastianFelix SidoniusFelix Prokopios
Hope you like some of these! (: