Where does “Oisín” come from?

Oisín (Irish) comes from Irish oisín, from Irish ós, from Old Irish úas, from Dutch wassen, from Dutch was, from Middle Dutch was, from Middle Dutch wassen, from Old Dutch wassan.

Ancestry of “Oisín”, step by step

Oisín traces back through two separate lines of ancestry.

via Irish oisín

StepLanguageWordMeaning
1IrishoisínDiminutive of os; fawn
2Irishóssince... is; Alternative form of ó; mouth
3Old Irishúasabove, over
4Dutchwassento wash, to clean; to grow, to rise, to increase,...
5Dutchwaslaundry, clothes that need to be washed, or just...
6Middle Dutchwasfirst/third-person singular past indicative of...
7Middle Dutchwassento grow, to wax; to increase
8Old Dutchwassanto grow, to wax; to rise in level
9Proto-West Germanicwahsanto grow
10Proto-Germanicwahsijanąto grow
11Indo-European*h₂weks-

via Irish os

StepLanguageWordMeaning
1Irishosdeer; over, above
2Old Irishoss
3Proto-Celticuxsūox, stag
4Proto-Indo-Europeanuksḗnbull
5Proto-Indo-Europeanh₂ug-s-ḗn
Every word from Indo-European *h₂weks-Every word from Proto-Germanic wahsijanąEvery word from Proto-West Germanic wahsan