'iipaach: "men" (Tiipay), plural of 'iipa or 'iipach, "man"
kwa'llyuw: Literally, "that are many". Nominalized with kw- from Campo/Los Conejos verb 'ellyuw, "are many, is a lot". Similar to Tiipay verb llyaw, nominalized to kwallyaw, kwa'llyaw, or kwa'llyáwa.
Compare:
'Iipaach 'ellyuw. "There are a lot of men (Lit. men are many)."
'Iipaach kwa'llyuw naam. "A lot of men went (Lit. men that are many went)."