Where does “óm” come from?

óm (Middle Irish) comes from Old Irish úam, from Old Irish mo, from Vietnamese máu, from Proto-Celtic *māyūs, from Proto-Indo-European meh₁- — to measure.

Ancestry of “óm”, step by step

óm traces back through two separate lines of ancestry.

via Old Irish úam

StepLanguageWordMeaning
1Old Irishúamcave
2Old Irishmomy
3Vietnamesemáublood; an inherent trait; health
4Proto-Celtic*māyūs
5Proto-Indo-Europeanmeh₁-to measure

via German Georg Ohm

StepLanguageWordMeaning
1GermanGeorg Ohm
Every word from Proto-Indo-European meh₁-Every word from Proto-Celtic *māyūsEvery word from Vietnamese máu