They're far too close for my liking. I'd be too polite to say it, but I'd presume you'd named your son after yourself and I wouldn't exactly find it cute. It's basically the same reason I wouldn't name a son Alistair, even though I really like the name. Sure, Alisha and Alistair only share the "Al" sound when said aloud, but they share five letters: Alisha, Alistair.