Even though Anil sounds feminine in my opinion, it’s okay if Anila wants to be the feminine form. So? Jordan sounds unisex but it has a feminine form, Anil is on the same page! Anil sounds like a girl’s name yet Anila is a feminine form! I think it’s cute that way! I think Anila is cute as the feminine form of Anil and it does sound more feminine than Anil, obviously!
I don't think it as a connection to the word 'anal'. Maybe I've known him too long but he has the nickname 'Nino' so that could explain a lot. I like Anil - it's original but I see nicknames for it as being a bit thin on the ground, see? For me, a nickname means a lot.