What does haan mean in french?

"Haan" is not a French word. It's likely you're thinking of a word from another language, perhaps Hindi or German.

* In Hindi, "haan" means "yes".

* In German, "ja" is the closest equivalent to "yes", and "ha" can be used as a filler word like "uh-huh" in English.

If you can provide more context about where you heard the word "haan", I can help you determine its meaning more accurately.