וַתַּ֥הַר ע֖וֹד וַתֵּ֣לֶד בֵּ֑ן וַתִּקְרָ֥א אֶת־שְׁמ֖וֹ אוֹנָֽן׃
Y concibió otra vez, y parió un hijo, y llamó su nombre Onán.
Targum Jonathan on Genesis
And she conceived again, and bare a son, and called his name Onan, because his father would have to mourn for him.