Son of Er (1Ch_4:21). Perhaps "Er, father of Lecah" means "founder of" Lecah, a town.
Fausset's Bible Dictionary
By Andrew Robert Fausset, co-Author of Jamieson, Fausset and Brown's 1888.
Le'cah. (progress). A name, mentioned in the genealogies of Judah, 1Ch_4:21 only, as one of the descendants of Shelah, the third son of Judah, by the Canaanites Bath-shua.
Smith's Bible Dictionary
By Dr. William Smith.Published in 1863
lē?ka (לכה, lēkhāh): A descendant of Judah (1Ch_4:21).
International Standard Bible Encyclopedia
PRINTER 1915.
Lecah
(Heb. Lecah', לֵכָה, perh. for יְלֵכָה, a journey, but according to Fürst, annexation; Sept. Ληχά v. r. Ληχάδ and Ληχάβ; Vulg. Lecha), a place in the tribe of Judah founded by Er (or rather, perhaps, by a son of his named Lecah), the first-named son of Shelah (1Ch_4:21). As Mareshah is stated in the same connection to have been founded by a member of the same family, we may conjecture that Lecah (if indeed a town) lay in the same vicinity, perhaps westerly.
CYCLOPEDIA OF BIBLICAL, THEOLOGICAL AND ECCLESIASTICAL
press 1895.