"Last Name" is a song composed by American country singer Carrie Underwood, Hillary Lindsey, and Luke Laird. It is the third single from Underwood's second studio album, Carnival Ride. It was released in the United States on April 7, 2008, by which point the song had already charted. At the 51st Grammy Awards, the song won Underwood her third consecutive Grammy Award for Best Female Country Vocal Performance. It has sold 1,300,000 copies to date.

The song is one of four tracks on the album co-written by Underwood, and the third consecutive one to be released as a single from the album. It is a moderate up-tempo describing a woman meeting a man at a club and later eloping with him in Las Vegas after having had too much to drink that night. She wakes up the next morning, "thinkin' 'bout Elvis somewhere in Vegas", to discover that she does not even know her last name (i.e., she married the man while she was intoxicated), and worries that her "mama would be so ashamed." The music video portrays the song as a prequel to her "Before He Cheats" song, even going so far as to hire the same actor to play the man in question.

The single was generally met with mixed reviews.

Allmusic picked the song as a "track pick", calling the song "Miranda Lambert filtered through Shania Twain", and dubbed it a "one night stand anthem."Rolling Stone picked the track as their favorite, saying "the most fun is "Last Name," where she gets wasted and runs off to Vegas with a guy she doesn't know."Blender awarded the song four out of five stars, describing the song as the "most irresponsible (and fun) moment on the new album involves one wild night, one too many shots of Cuervo and one unexpected ring."Billboard gave a positive review of the track, praising the lyrics: "It's a cleverly penned lyric that hilariously celebrates drunken debauchery" as well as summing it up as "a performance that combines soulful vocals, edgy intensity and sassy attitude into a delicious cocktail."

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