How do you say the word Madison in french?

There isn't a direct, official translation of "Madison" into French. The closest you can get is to use the phonetic spelling:

* Madisson (pronounced "ma-dee-sohn")

However, this is not a common or widely recognized name in French.

If you need to introduce someone named Madison in French, you could simply say:

* "Je vous présente Madison." (I'd like to introduce you to Madison.)

or

* "Voici Madison." (Here is Madison.)