Here is who makes the majority. Not hundred percent accurate:
Beled Hawo-----Hawlrersame, Reer Ahmed and Calidhere
Luugh --------Reer Ahmed, Cali Xussien and Reer Xassan
Doolloow ---------Reer Ahmed
Dhamasa---------Calidhere
Bardhere---------Talhe, Ugaas Sharmaarke
Garbaharey----------Reer Siyaad
Tuulo Burwaaq---------Reer Siyaad
Buurdhuubo----------Baha Guleed, Dhaweyd, and Reer Xassan
Sigaalow & Humbaale------------Cali Xussien
Ceelwaaq----------Uurmidig, Calidhere and Soonfure
Ceel Cadde & Ceel Gaduud ------Reer Garaad
Maykarebe ----- Habar Cisse
Gedodhawe & Khadijo Xaji ---- Hawlrersame, Soonfure and Calidhere
Diirhara-----Reer Kooshin, Reer Shirwac, Calidhere, Reer Ugaas Sharmaarke, Cali Xussien etc......you can find here just about every reer gedood marexaan.
I am missing out a bunch of marexaans......I don't know where Celi live in GEDO and I know they have a significant population in the region. I know Fiqi Yacquub live in Gedo too but I don't know exactly where. Probably one of the southern tuulos like Yaaqle.

As far as I know, there are no significant reer dalal, reer warsame, reer hersi, wegerdhec populations in Gedo.