zil'-pa (zilpah, meaning uncertain; Zelpha): The ancestress of Gad and Asher (Ge 30:10,12; 35:26; 46:18), a slave girl of Leah's, given her by Laban (Ge 29:24; 30:9). In Eze 48 the Zilpah tribes have the 5th division toward the South of Palestine and the 6th to the North, a slightly more favorable position than that of the Bilhah tribes.
The International Standard Bible Encyclopedia
Zilpah
The International Standard Bible Encyclopedia, James Orr (1915). Public domain, from the CrossWire SWORD module.