What would you do?

My husband and I are having a hard time deciding on a boy name... One of our final cuts is Aries... Because Arie is the name of my dads brother who passed and has been in my family for ten generations before that. Aries is similar without being exactly my uncle's name. We love it 
The draw back is that our sister in law is due two months before me and they are naming their daughter Aria ... Now she knew about my uncle and Arie being a family name prior to her choosing their baby's name... But do you think the names are too similar for us to go ahead with that choice? 
To me they sound very different and have different meanings Are-e-uh ( Aria ) vs Air-ease (Aries) 
What would you do?!