Where does “McGahan” come from?

McGahan (English) comes from Irish Mac Eacháin, from Irish each, from Old Irish ech, from Primitive Irish ᚓᚊᚐᚄ, from Proto-Celtic ekʷos, from Proto-Indo-European h₁éḱwos, from Proto-Indo-European h₁oh₁ḱu- — swift.

Ancestry of “McGahan”, step by step

StepLanguageWordMeaning
1IrishMac Eacháin—
2Irisheachhorse
3Old Irishechhorse
4Primitive Irishᚓᚊᚐᚄhorse
5Proto-Celticekʷoshorse
6Proto-Indo-Europeanh₁éḱwosstallion, horse
7Proto-Indo-Europeanh₁oh₁ḱu-swift
Every word from Proto-Indo-European h₁oh₁ḱu- →Every word from Proto-Indo-European h₁éḱwos →Every word from Proto-Celtic ekʷos →