Answer
Eirēnaîos is the transliteration of Irenaeus' Greek name. The transliteration process involves converting the Greek characters into their corresponding Latin equivalents. In this case, the Greek letters "ειρ" are transliterated as "eir," and the Greek letter "η" is transliterated as "ē." The final "ς" is transliterated as "s," resulting in the Latin spelling "Eirēnaîos."