Nicknames for Tristan?

My husband really wants a junior & I have no problem with that because I love him so much & our son will be lucky to be named after his amazing dad! However I don’t want to call them both Tristan. I feel like that’ll be weird & confusing. So I need a nickname for him. I’ve thought about just calling him his middle name, James, but looking for more options

PS we don’t like TJ