Nice one, didn’t think of that ! I suggested the one-letter town Y (population : 89), which is obviously much less well-known, but is also much smaller.

Edit : just realised, the airport city Roissy-en-France at under 3k inhabitants is a huge contender too that wasn’t mentioned

In France it might be Y (population : 89), famous for having a one-letter name. Far from “anyone can still instantly recognise the name” but still probably much more well-known than any other town this size.

Otherwise idk, feels like the only french city everyone would instantly recognise the name of is Paris tbh.