The modern Lemohai language is descended from Eastern Dahu, a language spoken on the island of Mohai and in Etsuri and Pekau, the nearest parts of mainland Aheku. ED was in turn descended from Dahu and ultimately Proto-Dahu-Kemba.
The Proto-Dahu-Kemba were a race of Ikhe, living in the north-east of Aheku. They then began a westward trek along the north coast. Archaeological evidence suggests the trek began around OH -186X (-1500 BC in our calendar).
Some PDK tribes reached what is now Pekau, others only went as far as modern Heiko. From this point on the speech of the two communities diverged, becoming separate Dahu and Kemba languages.