API - update non-constituent relationship's name

Is it possible to update a non-constituent relationship's name?

I see this PATCH: https://api.sky.blackbaud.com/constituent/v1/relationships/{relationship_id}

But it doesn't look like you can modify the name.

I guess I could do a GET / DELETE / POST, but the GET doesn't include all the name fields (e.g. title, middle, suffix) so if I did it that way, I'd lose some fields.

P.S. for anyone who's really familiar with these API endpoints - I swear the PATCH used to have a property called “relation” that was a NonConstituentAdd (as there is when you POST a relationship) - am I nuts? Looks like it's gone now…