Where does “nighean-bràthar” come from?

nighean-bràthar (Scottish Gaelic) comes from Scottish Gaelic nighean, from Old Irish ingen, from Primitive Irish ᚔᚅᚔᚌᚓᚅᚐ, from Proto-Celtic enigenā, from Proto-Indo-European ǵenh₁- — to produce, to beget, to give birth.

nighean-bràthar (Scottish Gaelic): fraternal niece

Definitions

fraternal niece

Ancestry of “nighean-bràthar”, step by step

nighean-bràthar traces back through two separate lines of ancestry.

via Scottish Gaelic nighean

Step	Language	Word	Meaning
1	Scottish Gaelic	nighean	daughter, female offspring; girl, maiden
2	Old Irish	ingen	daughter; maiden, virgin, young woman; nail
3	Primitive Irish	ᚔᚅᚔᚌᚓᚅᚐ	daughter
4	Proto-Celtic	enigenā	daughter
5	Proto-Indo-European	ǵenh₁-	to produce, to beget, to give birth

via Scottish Gaelic bràthair

Step	Language	Word	Meaning
1	Scottish Gaelic	bràthair	brother, male sibling
2	Old Irish	bráthair	brother, cousin, kinsman
3	Proto-Celtic	brātīr	brother
4	Proto-Indo-European	bʰréh₂tēr	brother

Every word from Proto-Indo-European ǵenh₁- →Every word from Proto-Celtic enigenā →Every word from Primitive Irish ᚔᚅᚔᚌᚓᚅᚐ →