Don't the English write Bâle instead of Basel sometimes? (An officially germaophone city.) It can be that English retains the French writing. Nothing wring with that.
Also somewhat interesting to me is that for some reason people think Belgium is mainly a French speaking country, but in fact there are actually more Dutch speakers than French speakers (56% vs 38% native speakers according to Eurostat in 2015) - I have the sense referring to Flemish cities by their French name reflects that
French imperialism used to be quite similar, after all.