Different artists with identical names?

With regard to tagging and the artist database, what should be done when there are two different artists with the same name?

Case in point: the artist of post #140230 is known as 'Choco' (http://0830.daa.jp/main.html - joint site with another artist '800'), but there's already another 'Choco' who seems to be a completely different artist.

What I usually do is add the circle name or site name in parentheses. masakichi_(crossroad) is one example.