You're right, but I would (personally) normally spell (and pronounce) that as "welch", so the "welsh" version did not occur to me.
Yes Trev, proper nouns are disallowed (are you playing this game without knowing the rules? See post 1). The problem is, it seems to me, that "Welsh" (as in being from Wales) is a proper adjective! The reason for not allowing proper nouns (or proper adjectives etc) in most word games is that one could capitalise just about any random string and claim it is a proper noun.
Okay then, we'll go with Welsh, and MikeSh and prpr are in nib.