take (one's) name in vain
To speak about someone when they are not present, as in a critical manner. The phrase comes from one of the Ten Commandments, which prohibits taking God's name in vain. Hey, I heard that! Don't take my name in vain!
take somebody’s name in ˈvain
show a lack of respect when using somebody’s name: I get very upset when people take God’s name in vain.(humorous) Have you been taking my name in vain again?This expression comes from the Bible.