Your hubby was probably called RJ becuase he was Raymond Jr. Trey is cute and you can always have more than 1 nick name
Trey!!! I think that it the way to go for a third generation namesake! :-)
I had a student whose name was George and he was third so he went by trey. I thought it was cool
Trey is a unique way for you to identify him! Love it! Maybe your husband and his family will call him RJ out of habit/tradition? Could be confusing if your hubby is still RJ to his family.
Ps. My dad is called Raymond. I called my little girl Raya x