Where does “cynorthwywyr” come from?

cynorthwywyr (Welsh) comes from Welsh cynorthwyo, from Welsh cynhorthwy, from Welsh can-, from Proto-Brythonic kanta-, from Proto-Indo-European ḱm̥-teh₂, from Proto-Indo-European ḱóm, from Proto-Indo-European ḱe, from Middle English kyt — to bend; curve; arch; vault; to bow, bend, arch,...

Ancestry of “cynorthwywyr”, step by step

StepLanguageWordMeaning
1Welshcynorthwyoto help, to aid, to assist
2Welshcynhorthwyassistance, help, aid, succour, relief
3Welshcan-with, after
4Proto-Brythonickanta-
5Proto-Indo-Europeanḱm̥-teh₂
6Proto-Indo-Europeanḱómbeside, near, by, with
7Proto-Indo-EuropeanḱeDeictic particle, here; Post-positional...
8Middle Englishkyt
9Germankittputty certain kinds of cement used for fixing e.g. window panes
10Old High Germankuti
11Proto-West Germanickwidugum, resin
12Proto-Germanickweduzresin
13Proto-Indo-Europeangʷet-resin, gum; to say, speak
14Proto-Indo-Europeangū-to bend; curve; arch; vault; to bow, bend, arch,...
Every word from Proto-Indo-European gū-