Where does “cucușel” come from?

cucușel (Romanian) comes from Romanian cuc, from Latin cucus — daw, jackdaw; cuckoo.

Ancestry of “cucușel”, step by step

Step	Language	Word	Meaning
1	Romanian	cuc	cuckoo; an extravagant thing; alone, isolated
2	Latin	cucus	daw, jackdaw; cuckoo