Namesakes
Characters in Greek Mythology:
2 characters
Eirene (f) 
Eirene (f)
Roman and Byzantine Emperors:
1 empress
Empress Irene Sarantapechaina (a.k.a. Eirene) 797-802
Saints:
1 saint
Saint Irene of Egypt (a.k.a. Eirene) ?-c. 305