The middle name is set as it's after my grandfather who practically raised me, but we can't decide on a first!

A little backstory..I have 2 girls named Aurora and Luna. After deciding on my second's name we found out they are actually sister goddesses! Aurora the goddess of dawn and Luna the goddess of night/the moon. They happen to also have a brother and his name is Sol. So that's why that's one of the options 😋 we want something with a bit of a "different" feel like our girls, but I get this bad feeling like if we decide to have more and we go with Sol that they wouldn't be included in that little mythological family and be left out..though that could just be me being a crazy pregnant lady haha do I need your opinions please!