Where does “perikum” come from?

perikum (Norwegian Nynorsk) comes from Latin hypericum, from Ancient Greek ὑπερικόν, from Ancient Greek ὑπέρεικος, from Ancient Greek ῠ̔πο-, from Ancient Greek ὑπό, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

perikum (Norwegian Nynorsk): Hypericum (usually St. John's wort or spotted St. John's wort)

Definitions

Hypericum (usually St. John's wort or spotted St. John's wort)

Ancestry of “perikum”, step by step

Step	Language	Word	Meaning
1	Latin	hypericum	—
2	Ancient Greek	ὑπερικόν	—
3	Ancient Greek	ὑπέρεικος	St John's wort
4	Ancient Greek	ῠ̔πο-	under, lower; by, under; under”, “beneath
5	Ancient Greek	ὑπό
6	Proto-Indo-European	upó	under, below
7	Proto-Indo-European	h₃ewp-	—

Every word from Proto-Indo-European h₃ewp- →Every word from Proto-Indo-European upó →Every word from Ancient Greek ῠ̔πο- →