How would I go about doing this?

I am currently pregnant with a baby girl, she's almost 20 weeks. My SO and I are in LOVE with the name Myla for her.... But the problem is, my best friend of 15 years said she wanted to name her daughter that first - if she ever has one. By no means am I wanting it because she does, I am in love with the name and would have been if she mentioned it or not. I hated half the names she said she likes for her kids "one day". Not to mention she is on birth control too. I am so nervous to ask/tell her about the name. Has anyone else been in this dilemma? I'm so stressed. Myla is the ONLY name I want, from the moment I conceived her. She's Myla.