I agree! I didn't realise it was such a commen name!
anyways, my dad thought it would be funny to call her "hank", and soon my brothers, being boys, where in on it, so I had to think of a name fast and Sunny comes to mind! I think it's a great name for such a happy tiel!
(My brothers and dad have started calling Sunny, Sunny bill williams after the rugby player now, but atleast shes not hank.)