Swith
Origin 1
From Middle English, from Old English swīþ ("strong, mighty, powerful, active, severe, violent"), from Proto-Germanic *swinþaz ("strong"), from Proto-Indo-European *swento- ("active, healthy"). Cognate with Old Saxon swÄ«th, Middle High German swind (Modern German geschwind ("fast, quick, swift")), Dutch gezwind ("fast, quick, swift"), Old Norse svinnr, Gothic ðƒð…ðŒ¹ðŒ½ðŒ¸ðƒ (swinþs, "strong"). Related to sound.
Origin 2
From Middle English swith, swithe, from Old English swīþe ("very much, exceedingly, severely, violently, fiercely"), from Proto-Germanic *swinþa ("strongly"), from Proto-Indo-European *swento- ("active, healthy"). Not cognate to superficially similar swift, as these have distinct PIE roots, though both share *swe- prefix in PIE.