Where does “Cu” come from?

Cu (Translingual) comes from Latin cuprum, from Ancient Greek Κύπρος, from Ancient Greek -ῐος, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “Cu”, step by step

Step	Language	Word	Meaning
1	Latin	cuprum	copper
2	Ancient Greek	Κύπρος	Cyprus
3	Ancient Greek	-ῐος	belonging to; of”, “belonging to”, “pertaining to
4	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

Every word from Proto-Indo-European -yós →Every word from Ancient Greek -ῐος →Every word from Ancient Greek Κύπρος →