Where does “CD-levy” come from?

CD-levy (Finnish) comes from Finnish levy, from Finnish -u, from Proto-Finnic -u — Forms nouns from adjectives, nouns.

CD-levy (Finnish): A compact disc optical disc used to store data

Definitions

CD-levy traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Finnish	levy	plate; board; slab
2	Finnish	-u	Forms nouns from verbs. Most common with "e"- and...
3	Proto-Finnic	-u	Forms nouns from adjectives, nouns

Step	Language	Word	Meaning
1	Finnish	CD	CD, compact disc
2	English	CD	The corps diplomatique, or diplomatic corps of a...
3	Russian	-шка	—