How do you say Melanie in Irish Gaelic?

There isn't a direct translation of "Melanie" in Irish Gaelic that perfectly captures the meaning or sound. Irish names tend to have distinct origins and meanings. However, you could choose a name with a similar meaning or sound:

* Méabh (Mave): This is a well-known and beautiful Irish name. While not a direct translation, it shares a similar elegant sound.

The best option really depends on the context and what feeling you want to convey. If you need a name that sounds similar for a character or something similar, Méabh would be a strong choice. If you're trying to find a name with a similar meaning (Melanie's meaning varies, but often relates to dark or black), you'd need to look at other options and consider the specific meaning you want to emphasize.