what do you do when your family doesn’t like your babies name

I’m due in a week and we’ve finally decided on my sons name. I’ve been hesitant because I asked about the name months and months ago and my mom said she didn’t really like it. but we love it and have for a long time, so we’re just going with it. I’m willing to bet some money that my 18 year old sister will give me shit for it because she’s so negative and judgemental, and tells everyone my business. what do you guys say if someone doesn’t like your baby name? I have a lot of anxiety about this is just can’t help it because I know there will be people who will talk crap about it behind my back