Where does “Swifty” come from?

Swifty (English) comes from English Y, from English yuri, from Japanese 百合, from Japanese 連用形, from Japanese 見る, from Japanese 夢, from Old Japanese 夢, from Japanese 目.

Ancestry of “Swifty”, step by step

Swifty traces back through two separate lines of ancestry.

via English Y

StepLanguageWordMeaning
1EnglishYA figure or mark in the shape of the letter Y; A...
2EnglishyuriA narrative or visual work featuring a romance or...
3Japanese百合lily
4Japanese連用形an inflectional category: the continuative or...
5Japanese見るto see, to watch, to observe, to look at...
6Japanesea dream; a vision; leaving reality to the state...
7Old Japanesea dream
8Japanesean order in biology: smaller than a class, bigger...
9Middle Chinese

via English Swift

StepLanguageWordMeaning
1EnglishSwiftoriginally a nickname for a swift or quick person
2Middle Englishswift
3Old Englishswiftswift, quick
4Old Englishswīfanto revolve, sweep, wend, intervene; to move,...
5Proto-West Germanic*swībanto revolve, to move around
6Proto-Germanicswībanąto revolve; move around; sway; stray; to sweep;...
7Proto-Indo-Europeanswey-to twist, swing; to hiss; whistle; to swing,...
8Proto-Indo-Europeansew-to press out, extract; juice; liquid, rain; to...
Every word from Middle Chinese