False friends usually aren’t homonyms since the word comes from different languages.

To give an example: an English speaker might look at “rare auto” (Dutch) and might translate it to “rare car”. But “rare” means “weird” in Dutch. So rare is a false friend in this case

Edit: an example of one a false friend that is a homonym is “horloge” in French and Dutch. They are pronounced and written the same, but it means “clock” in French but “(wrist)watch” in Dutch