Anthony is feminized as "Antonia", William as Wilhelmina (William is the anglicized version of Wilhelm). and you've missed some obvious ones: Daniel as Daniella; Rene as Renee; Noel as Noelle; Charles as Charlotte.
Daniel is in Female Versions of Male Names #1. Antonia is the feminine version of Antonio (which I noted in #1 before I had split the quiz into two parts). I didn't include names like Antonio (Greek, Italian, Spanish, Portuguese and Maltese), Rene(e) and Noel(le) (French), or Wilhelm(ina) (German) because there are a nearly infinite number of languages, and I can't include them all. Even including all of the European languages would be an enormous task. I chose to include only English names to keep the scope reasonable.
With further regard to Noel and Rene, nearly all French male names can be made feminine by adding an e to the end. There would be too many French names to add, and the answers would be too obvious to warrant a quiz.
With further regard to Noel and Rene, nearly all French male names can be made feminine by adding an e to the end. There would be too many French names to add, and the answers would be too obvious to warrant a quiz.