Clients name within painting

[Patt Legg]

I hope this is in the correct thread under the Technique part. I have noticed some artists adding a client's name within the painting itself. Someone here on the Forum has done just that, I think, but cannot remember who.

This name looks as if it has been block printed usually above the portrait, sometimes below, but in something like an open block.

Just curious if it is a certain style or by request of the client? It seems that whereever I have seen it, it was within a very stylish portrait or political person. I like it but curious how one did that so precisely?

Thanks ahead of time.