I like the name Tatsu... it's the Japanese word for dragon.
I wanna call our next boy beardie Tatsu, but I reckon it'd work for either gender.
Sam is good too, it works for boys or girls. A little boring perhaps.
Other generic names you could use: Peanut, Fudge, Squishy (LOL anyone get the Nemo reference? "He shall be mine, and I shall call him Squishy, and he shall be my Squishy")

I think Squishy is a cute name. Umm what else is unisex, Monty (usually a boy pet name but I know a girl dragon called Monty), Speedy, Loki, Yoshi.
Hope you come up with something you like! Don't worry if you don't settle on something straight away ... it took us over a week to name Diego, and three weeks to name Phoenix!!