Current stab at High Gothic (Latin) translations of all the primarchs' names. As a rule of thumb I went with the 2nd declension masculine singular, but used the plural for Alpharius. And Fulgrim is in the 3rd declension neuter. Jaghatai's is based on the Turkish pronunciation (that's a capital i not a lowercase L).
Leo Calibani (lit. Lion of Caliban)
(occultus)
Fulgur (also illa podicem)
Perturabus
Iogateus Caganus
Lemanus Ruber
Rogalus Dornus
Conradus Curzus
Angelus Magnus (lit. The Great Angel)
Ferrus Manus (lit. ferrus manus)
(occultus)
Iratus
Robutus Guillimanus
Mortarius
Magnus Ruber
Horus Lupercalus
Lorgar Aurelianus
Vulcanis
Corvus Coraxus
Alpharii Omegoni
















