Yawn
Old English geonian, of Germanic origin, from an Indo-European root shared by Latin hiare and Greek khainein . Current noun senses date from the early 18th century.
wiktionary
Partly from Middle English yanen, yonen, yenen(“to yawn”), from Old English ġinian(“to yawn, gape”), from Proto-Germanic *ginōną(“to yawn”); and partly from Middle English gonen(“to gape, yawn”), from Old English gānian(“to yawn, gape”), from Proto-Germanic *gainōną(“to yawn, gape”); both from Proto-Indo-European *ǵʰi-, *ǵʰeyh₁-(“to yawn, gape”). Cognate with North Frisian jåne(“to yawn”), Saterland Frisian jaanje, joanje(“to yawn”), Middle Dutch genen, ghenen(“to yawn”), German Low German jahnen(“to yawn”), German gähnen(“to yawn, gape”), dialectal Swedish gana(“to gape, gawk”), dialectal Norwegian gina(“to gape”).
Compare also Old Church Slavonic зѣѭ(zějǫ) (Russian зи́нуть(zínutʹ), зия́ть(zijátʹ)), Greek χαίνω(khaínō)), Latin hiō, Tocharian A śew, Tocharian B kāyā, Lithuanian žioti, Sanskrit जेह्(jeh)
etymonline
yawn (v.)
c. 1300, yenen, yonen, from Old English ginian, gionian "open the mouth wide, yawn, gape," from Proto-Germanic *gin- (source also of Old English giwian, giowian, giwan "to request," Old Norse gina "to yawn," Dutch geeuwen, Old High German ginen"to be wide open," German gähnen "to yawn"), from PIE root *ghieh- "to yawn, gape, be wide open." Modern spelling is from 16c. Related: Yawned; yawning.
yawn (n.)
"act of yawning," 1690s, from yawn (v.). Meaning "boring thing" is attested from 1889.
