[vidarh]

I'd say you want to be consistent within the same context. Otherwise it's their own fault if they can't ask you for something more specific.

E.g. if they want a display name, they should ask for a display name. Most of the time people need only a few different roles, and you can always pre-populate default values based on doing a simple name split and letting people suggest more approriate alternatives.

Upside is that asking for specifically what they need addresses other concerns, such as e.g. parents signing up to something on behalf of their children, or someone needing to put another name of a shipping label.