Mulekites

THE PEOPLE OF ZARAHEMLA (MULEKITES). 

In the third century B.C., when the Nephite leader Mosiah ₁ and his company moved from the land of Nephi down to the Sidon river, "they discovered a people, who were called the people of Zarahemla" (Omni 1:13-14) because their ruler bore that name. These people were descendants of a party that fled the Babylonian conquest of Jerusalem in 586 B.C., among whom was a son of the Jewish king Zedekiah, Mulek. Hence Latter-day Saints often refer to the descendants of this group of people as Mulekites, although the Book of Mormon never uses the term. When discovered by the Nephites around 200 B.C., this people was "exceedingly numerous," although culturally degenerate due to illiteracy and warfare (Omni 1:16-17). The Nephite account says the combined population welcomed Mosiah as king.

Mosiah found that the people of Zarahemla had discovered the last known survivor of the Jaredites shortly before his death. By that means, or through survivors not mentioned, elements of Jaredite culture seem to have been brought to the Nephites by the people of Zarahemla (CWHN 5:238-47). The fact that the people of Zarahemla spoke a language unintelligible to the Nephites further hints at an ethnic makeup more diverse than the brief text suggests, which assumes a solely Jewish origin.

The Mulekites are little referred to later, probably because they were amalgamated thoroughly into eclectic Nephite society (Mosiah 25:13). However, as late as 51 B.C., a Lamanite affiliate who was a descendant of king Zarahemla attacked and gained brief control over the Nephite capital (Hel. 1:15-34)

(Source: http://eom.byu.edu/index.php/Book_of_Mormon_Peoples)