Where does “sevói” come from?

sevói (Paraguayan Guaraní) comes from Spanish cebolla, from Old Spanish cebolla, from Late Latin cepulla, from Latin cēpa — onion.

Ancestry of “sevói”, step by step

Step	Language	Word	Meaning
1	Spanish	cebolla	onion
2	Old Spanish	cebolla	onion
3	Late Latin	cepulla	onion-bed, onion-field; small onion
4	Latin	cēpa	onion