Soon
Old English sōna ‘immediately’, of West Germanic origin.
wiktionary
From Middle English soone, sone, from Old English sōna(“immediately, at once”), from Proto-West Germanic *sān(ō), from Proto-Germanic *sēna, *sēnô(“immediately, soon, then”), from *sa(demonstrative pronoun), from Proto-Indo-European *só(demonstrative pronoun).
Cognate with Scots sone, sune, schone(“soon, quickly, at once”), North Frisian san(“immediately, at once”), dialectal Dutch zaan(“soon, before long”), Middle Low German sân(“right afterwards, soon”), Middle High German sān, son(“soon, then”), Old High German sār(“immediately, soon”). Compare also Gothic 𐍃𐌿𐌽𐍃( suns, “immediately, soon”), from Proto-Germanic *suniz(“soon”).
etymonline
soon (adv.)
Old English sona "at once, immediately, directly, forthwith," from Proto-Germanic *sæno (source also of Old Frisian son, Old Saxon sana, Old High German san, Gothic suns "soon"). Sense softened early Middle English to "within a short time" (compare anon, just (adv.)). American English. Sooner for "Oklahoma native" is 1930 (earlier "one who acts prematurely," 1889), from the 1889 opening to whites of what was then part of Indian Territory, when many would-be settlers sneaked onto public land and staked their claims "sooner" than the legal date and time.
