I like Lea because it's different, and I like Leigh and Leah too. then again it's just a pretty name all the way around. There is one more variation for Rebecca, and it's Rebekkah, but then again it's really not that different. Rebecca is a pretty name, so I like it all the way around. Alannah is beautiful too, I'd go with Alawna for a different spelling but either way you spell it it's a unique name.