The name Nathaly is a girl's name . Nathaly and discussed in our forums with posts like "Girls Makeover - Two Middles".
From the experts:
This variant of the more popular spellings swaps out the -ie ending for a y, though the result is a name that is more reminiscent of Italy than a girl's name. While it has ranked in the US Top 1000 since 2004, it sits a couple hundred spots behind Nathalie (Number 670), and it pales in comparison to the constant Natalie (Number 31).