Original: Originally named Warsaw, the band primarily consisted of Ian Curtis (vocals and occasional guitar), Bernard Sumner (guitar and keyboards),Sumner was also credited as "Bernard Dicken", "Bernard Albrecht" and "Bernard Albrecht-Dicken" on Joy Division releases Peter Hook (bass guitar and backing vocals) and Stephen Morris (drums and percussion).
Simplified: It was made up of Ian Curtis (vocals), Peter Hook (bass guitar), Stephen Morris (drums) and Bernard Albrecht (AKA Sumner, guitar).