Where does “Zwilling” come from?

Zwilling (English) comes from German Zwilling, from Middle High German zwillinc, from Old High German zwiniling, from Proto-Germanic twinilingaz, from Proto-Germanic -ilingaz, from Proto-Germanic -ilaz, from Proto-Indo-European -lós — Forms agent nouns from verbal roots.

Ancestry of “Zwilling”, step by step

StepLanguageWordMeaning
1GermanZwillingtwin
2Middle High Germanzwillinc
3Old High Germanzwiniling
4Proto-Germanictwinilingaz
5Proto-Germanic-ilingazForms noun-derivatives with sense of 'belonging...
6Proto-Germanic-ilazagent suffix; diminutive suffix
7Proto-Indo-European-lósForms agent nouns from verbal roots
Every word from Proto-Indo-European -lósEvery word from Proto-Germanic -ilazEvery word from Proto-Germanic -ilingaz