Where does “ペガサス” come from?

ペガサス (Japanese) comes from English pegasus, from Middle English Pegase, from Latin Pēgasus, from Ancient Greek Πήγασος.

Ancestry of “ペガサス”, step by step

Step	Language	Word	Meaning
1	English	pegasus	A winged horse
2	Middle English	Pegase	—
3	Latin	Pēgasus	—
4	Ancient Greek	Πήγασος	—

ペガサス — Etymology, Origin & Word History | Etymology Explorer