hearken

From Middle English herkenen (“to listen (attentively); to pay attention, take heed”) [and other forms], from Old English hercnian, heorcnian, hyrcnian, from *heorcian (“to hark”) infixed with -n-, from Proto-West Germanic *hauʀijan, from Proto-Germanic *hauzijaną (“to hear”), from Proto-Indo-European *h₂ḱh₂owsyéti (“to be sharp-eared, hear well”), from *h₂eḱ- (“sharp”) + *h₂ṓws (“ear”) + *-yéti (denominative suffix), thus equivalent to hark + -en. The spelling of the English word was probably influenced by hear; a similarly analogical pronunciation existed in Early Modern English.

出典: Wiktionary「hearken」（CC BY-SA 4.0）