Where does “alfagras” come from?

alfagras (Norwegian Bokmål) comes from Norwegian Bokmål gras, from Old Norse gras, from Proto-Germanic grasą, from Proto-Indo-European ǵʰreh₁- — to become green, grow; to grow; to green, to grow.

Ancestry of “alfagras”, step by step

alfagras traces back through two separate lines of ancestry.

via Norwegian Bokmål gras

Step	Language	Word	Meaning
1	Norwegian Bokmål	gras	alternative form of gress
2	Old Norse	gras	grass, herbage; a herb, usually with special...
3	Proto-Germanic	grasą	grass
4	Proto-Indo-European	ǵʰreh₁-	to become green, grow; to grow; to green, to grow

via Norwegian Bokmål alfa

Step	Language	Word	Meaning
1	Norwegian Bokmål	alfa	alpha, first letter of the Greek alphabet;...
2	Ancient Greek	ἄλφα	alpha, the name for the first letter Α, α of the...
3	Phoenician	𐤀𐤋𐤐	thousand; bull, ox, head of cattle
4	Proto-Semitic	*ʔalp-	thousand

Every word from Proto-Indo-European ǵʰreh₁- →Every word from Proto-Germanic grasą →Every word from Old Norse gras →