Irina S. answered 04/11/19
PhD in Slavic Linguistics with 20+ Years of Teaching Experience
Меня зовут Ирина = My name is Irina literaly translates like " people call me Irina" . That's why call - зовут 3 person, plural.
You can use singular for special situation:
Меня зовут Ирина, но дедушка зовёт меня Ириша. (...but grandpa calls me Irisha).