The Chasidim may give each Rebbe a unique name…
Sometimes it’s based on his actual name, sometimes based on a Sefer he wrote, sometimes based on where he lived, and sometimes based on something else…
1. Alter Rebbe (Baal Hatanya V’Shulchan Aruch)
2. Mittler Rebbe
3. Tzemach Tzedek
4. MaHaRash
5. RaShab
6. RaYaTz (Der Frierdiger Rebbe)
7. The Rebbe (Nishmaso Eden)