In my groups, I have friend who has very similar name like mine (except last name). And sometimes, we get confused who spent what or who owes whom.

For example, there are two people with these names,
John Doe and John Douglas

So everywhere we see,
John D owes John $55
John D paid John D $22

I like current short naming of splitwise but in exceptional cases when both name are same in a line, I think it'll be awesome to display full names.