rohtoemäkki (Finnish) comes from Finnish rohto, from Finnish ruoho, from Proto-Finnic rooho, from Proto-Germanic grasą, from Proto-Indo-European ǵʰreh₁- — to become green, grow; to grow; to green, to grow.
Ancestry of “rohtoemäkki”, step by step
rohtoemäkki traces back through two separate lines of ancestry.