a defective preterit agentive serving as a base for "quēn" in "quēnamî"
Lockhart says this amî is a substantive which appears to have originated as the preterit agentive of some verb expressing manner. In the first and second persons quēn is separate from amî, which bears the subject prefix: Quēn amamìquê? How are you (pl.)? What manner of people are you?