Extended Strong's Hebrew Lexicon (Brown-Driver-Briggs based)
Er
Usage: A man of the tribe of Judah living at the time of Egypt and Wilderness, first mentioned at Gen.38.3; son of: Judah (H3063) and Bath-shua (H1323I); brother of: Onan (H0209) and Shelah (H7956); half-brother of: Perez (H6557) and Zerah (H2226I); married to Tamar (H8559) § Er = "awake" 1) the eldest son of Judah 2) son of Shelah and grandson of Judah