Where does “sái” come from?

sái (Paraguayan Guaraní) comes from Spanish saya, from Vulgar Latin sagia, from Latin sagum, from Ancient Greek σάγος, from Latin sagus, from Latin sāgiō, from Proto-Italic sāgiō, from Proto-Indo-European séh₂gyeti — to seek out.

Ancestry of “sái”, step by step

StepLanguageWordMeaning
1Spanishsayaa woman’s skirt
2Vulgar Latinsagiaskirt
3Latinsagumsagum, a military cloak; singular accusative of...
4Ancient Greekσάγοςcloak; coat, habit
5LatinsagusArchaic form of sagum; divining, prophetic
6Latinsāgiōto perceive quickly or keenly with the senses
7Proto-Italicsāgiō
8Proto-Indo-Europeanséh₂gyetito give a sign
9Proto-Indo-Europeanseh₂g-to seek out
Every word from Proto-Indo-European seh₂g-