If you must give your kid a Buffyverse name, the kindest thing to do would be to name them after an Angel character: Angel, Cordelia, Wesley, Charles, Winifred, Lorne, Lindsey, and Lilah are all nice, normal names.
BTVS names are just weird and it would just be cruel to name a kid Buffy Rupert, Oz, or other such names. Granted, Alexander is a normal name as is Tara, Dawn, and Faith... but BTVS has a lot less normal names and Angel.
The person who names their kid Clem will have earned the title Biggest Fan.