mn - what; the one who, who, who(so)ever (DUL 560)

It is possible that the pronoun should be differently vocalized in the meaning “what”, on the one hand, and “who”, on the other hand (see PS *mann- ‘who?’ and *mīn- ‘what?’). The forms with n are used as synonyms for my and mh. See Kogan 2009:72.