The phrase "took name in vain" is often used to describe the act of using someone's name disrespectfully or without due reverence. There are several synonyms for this phrase that carry a similar connotation. One such synonym is blasphemy, which refers specifically to speaking irreverently about religious figures or concepts. Profanity is another synonym that can describe the use of someone's name or other words in a disrespectful or vulgar manner. To defame or slander someone's name also falls under the same category, as it involves tarnishing someone's reputation through speech or actions. These synonyms all capture the negative impact that can occur when someone's name is not given the proper respect it deserves.