He married her against the counsel and example of his parents. But when Judah had committed so great a crime as the selling of his brother, and God had forsaken him, no wonder he adds one sin to another. Shuah was the name, not of the daughter, but of her father, Genesis 38:12.
Related Commentaries of Genesis 38:2
Genesis 38:2
2 And Judah saw there a daughter of a certain Canaanite, whose name was Shuah; and he took her, and went in unto her.