Characters with different names

Anna= Anya

Alex= Xander

Darcy= Darla

Larry = Lorne

Cyle = Clem

Liam = Angel

Caory = Cordelia

Elizabeth = Buffy

Obvious ones:

Dawnie = Dawn

Willow = Willow

Tara = Tara

Charles = Gunn  ((its his first name on the show!))

Winifred = Fred 

Wesley = Wesley

Connor/Steven = Connor/Steven

William = Spike