I assumed he always went by Logan- my grandfather/uncle/cousin are all Paul Edward but they alternate which name they use: my grandfather went by Paul, my uncle goes by Edward, and my cousin goes by Paul

I assumed he just always went by Logan too. Not that he doesn't want to be associated with his dad, but he wants to be seen as his own person.

I reckon he gets annoyed if people call him John though

He defs yelled at a substitute teacher who refused to call him Logan bc that's not what was on the register.

i bet logan goes by logan bc of cordelia wanting him to be seen as his own person