Where does “Pohjois-Pohjanmaa” come from?

Pohjois-Pohjanmaa (Finnish) comes from Finnish Pohjanmaa, from Finnish mää, from Finnish -inen, from Finnish -uus, from Proto-Finnic -uc — -ness, -hood.

Ancestry of “Pohjois-Pohjanmaa”, step by step

Pohjois-Pohjanmaa traces back through two separate lines of ancestry.

via Finnish Pohjanmaa

StepLanguageWordMeaning
1FinnishPohjanmaaOstrobothnia
2Finnishmääbaa; I
3Finnish-inen-like, -ous, -y; -en; Creates adjectives from...
4Finnish-uusForms nouns from adjectives, expressing a quality
5Proto-Finnic-uc-ness, -hood

via Finnish pohjoinen

StepLanguageWordMeaning
1Finnishpohjoinennorth; northern
2Finnishpohjabottom; bed; fundament
3Proto-Finnicpohjabottom; base, foundation; north
4Proto-Finno-Permicpošja—
Every word from Proto-Finnic -uc →Every word from Finnish -inen →Every word from Finnish -uus →