The name Amilyn is a girl's name . Amilyn and discussed in our forums with posts like "Girls Makeover - Two Middles".
From the experts:
Amilyn is one of those names that sounds and feels a lot like other more popular names, from Emmeline to Amelia to Adeline, but was given to fewer than five baby girls in the US in 2016. That is changing with the release of the new Star Wars movie, featuring a character named Amilyn played by Laura Dern. Another newly-minted name, Kylo, was the fastest rising baby name of 2016, and Amilyn could grab that title in the 2017 or 2018 statistics.