From Wiktionary, the free dictionary
From jasy (“moon”) + po (“five”).
jasypo
- May
- (Gregorian calendar months) Gyregório arapapaha jasy; jasyteĩ, jasykõi, jasyapy, jasyrundy, jasypo, jasypoteĩ, jasypokõi, jasypoapy, jasyporundy, jasypa, jasypateĩ, jasypakõi (Category: gn:Months)