Mystery theme II by KlionskyG

Question 4

1. The Biblical Judah's middle son (of three) was put to death after "displeasing" God for taking a certain action instead of fulfilling his brotherly obligations. In the 18th century, his name became a euphemism for that "displeasing" action. What was his name?

2. He said about the opera singer Maria Callas, "There [was] just a natural curiosity; after all, we were the most famous Greeks alive in the world." You might question his ethics - supposedly their affair continued even after he married someone even more famous in 1968. What's his last name?

ONA - Onan; Onassis