Onan

Boyd’s Bible Dictionary:

(strong). Second son of Judah, slain for wickedness (Gen. 38:4-10; Num. 26:19).

Concise Bible Dictionary:

Second son of Judah by a Canaanitess, “daughter of Shua”; he was slain by Jehovah for his sin (Gen. 38:4-10; Gen. 46:12; Num. 26:19; 1 Chron. 2:3).

Strong’s Dictionary of Hebrew Words:

Number:
209 (find all occurrences in KJV Bible)
Transliteration:
’Ownan
Phonic:
o-nawn’
Meaning:
a variation of 207; strong; Onan, a son of Judah
KJV Usage:
Onan

Jackson’s Dictionary of Scripture Proper Names:

their vigor (feminine): their iniquity

Potts’ Bible Proper Names:

Strong; stout; ability; powerful:―second son of Judah [ONAM], Gen. 38:4. {Valens}