Where does “lapinkielinen” come from?

lapinkielinen (Finnish) comes from Finnish lappi, from Swedish läpp, from Old Swedish lapper, from Finnish lappalainen, from Finnish -läinen, from Finnish laji, from Old Swedish slagh, from Middle Low German slach — to hit.

Ancestry of “lapinkielinen”, step by step

lapinkielinen traces back through two separate lines of ancestry.

via Finnish lappi

StepLanguageWordMeaning
1FinnishlappiThe Sami language, Lappish; A Sami person
2Swedishläpplip
3Old Swedishlapper
4FinnishlappalainenA Sami
5Finnish-läinenFront vowel variant of -lainen
6Finnishlajikind, sort; species; sport
7Old Swedishslagh
8Middle Low Germanslach
9Old Saxonslag
10Proto-West Germanicslagiblow, strike
11Swedishslaggslag metallurgical waste material
12Low Germanslagge
13Middle Low Germanslagge
14Middle Low Germanslānto hit, strike
15Old Saxonslāhanto hit

via Finnish kielinen

StepLanguageWordMeaning
1Finnishkielinenbeing of a language; used mainly as head word in...
2Finnishkielitongue; language; string
3Proto-Finnickeelitongue; language
4Proto-Uralickäletongue; language
Every word from Old Saxon slāhanEvery word from Middle Low German slānEvery word from Middle Low German slagge