Where does “bjørkefink” come from?

bjørkefink (Norwegian Bokmål) comes from Norwegian Bokmål fink, from Middle Low German vinke, from Old Saxon *fink, from Proto-Germanic finkiz, from Proto-Indo-European (s)pingos — chaffinch.

bjørkefink (Norwegian Bokmål): brambling, the bird "Fringilla montifringilla"

Definitions

brambling, the bird "Fringilla montifringilla"

Ancestry of “bjørkefink”, step by step

bjørkefink traces back through two separate lines of ancestry.

via Norwegian Bokmål fink

Step	Language	Word	Meaning
1	Norwegian Bokmål	fink	a bird of the family Fringillidae, the finches
2	Middle Low German	vinke	—
3	Old Saxon	*fink	—
4	Proto-Germanic	finkiz	finch
5	Proto-Indo-European	(s)pingos	chaffinch

via Norwegian Bokmål bjørk

Step	Language	Word	Meaning
1	Norwegian Bokmål	bjørk	a birch; birch
2	Old Norse	bjǫrk	birch, birch tree
3	Proto-Germanic	birkijǭ	birch
4	Proto-Indo-European	bʰerHǵos	birch

Every word from Proto-Indo-European (s)pingos →Every word from Proto-Germanic finkiz →Every word from Old Saxon *fink →