On the etymological relationships of wank, swank, and wonky

The English slang verb wank (off) ‘(of a male) to masturbate; to masturbate (a male)’ has no generally accepted etymology. Using historical and dialectal English data, comparative data from German and other Germanic languages, and a parallel semantic development in French, I establish an etymology for wank, connect it etymologically to English swank (and the exactly parallel German wanken ‘to sway, shake, wobble, totter, etc.’ with its apparent s-mobile partner schwanken ‘to sway, shake, tremble, stagger, totter, etc.’, and items related to these) and wonky ‘shaky, unstable, etc.’, and offer surmises about etymologies and relationships among these items and wang, yang ‘penis’; wonk; and yank (for the last two of which there are also no generally accepted etymologies).