köken: From Middle High German daȥ, from Old High German daȥ, from Proto-Germanic *þat. Compare Silesian East Central German doas, Dutch dat, English that. Doublet of dass. Distinction from dass is purely orthographical convention.
for (on behalf of) · for (in order to obtain) · for (over a period of time)
eş: per
köken: From Old Galician-Portuguese por, from Late Latin pōr, from Latin prō (“for”) (with metathetic shift under the influence of per). Usurped the roles of Latin per.