Where does “seasmhaigh” come from?

seasmhaigh (Irish) comes from Irish seasamh, from Old Irish sessam, from Old Irish sissidir, from Proto-Celtic sista-, from Proto-Indo-European stísteh₂ti, from Proto-Indo-European steh₂- — to stand.

Ancestry of “seasmhaigh”, step by step

StepLanguageWordMeaning
1Irishseasamhverbal noun of seas; standing, a standing...
2Old Irishsessamverbal noun of sissidir: standing; standing by,...
3Old Irishsissidirto stand
4Proto-Celticsista-—
5Proto-Indo-Europeanstísteh₂tito be standing up, to be getting up
6Proto-Indo-Europeansteh₂-to stand
Every word from Proto-Indo-European steh₂- →Every word from Proto-Indo-European stísteh₂ti →Every word from Proto-Celtic sista- →