In French, Blanche is lovely. I also like Blanchette and Blanchefleur as GPs.
In English, Blanche is frankly hideous. Blanch is even worse, as "to blanch" the literal term in English for whitening something or removing color, or scalding / parboiling food.
***
Please rate my personal name lists:
www.behindthename.com/pnl/69381www.behindthename.com/pnl/69381/117507www.behindthename.com/pnl/69381/109399www.behindthename.com/pnl/69381/132018