The Hittite word a-ku-
Word a-ku-
IPA aku-
Meaning sea-shell
See also Proto-Indo-European: ĝʰeh₂u- ‘to yawn, to gape’
Greek: αχηβάδα ‘sea-shell’

Comments

The only Indo-European match is in Greek. Probably from thee Indo-European root ǵʰeh₂u-.