Proto-IE: *kom
Meaning: prep./adv.
Hittite: kan (encl.)
Old Indian: kam `a particle used after datives of persons and abstract nouns'
Germanic: *ga-, *gi-
Latin: cum prp., com-, con-, cō- prf., usw.
Celtic: OIr co-n- prp. 'mit', prf. Gaul com-, OIr com-, con-, Cymr cyf-, cyn-, Corn cev-
References: WP I 326, 458 f
