Valanciunas was one of 18 players selected to the Rising Stars Challenge, and Barkley was attempting to assign the Lithuanian big man to a team managed by fellow commentator Grant Hill.
Barkley's pronunciation came out something like "JOE-nuss Vas-so-EE-noo-on-shawsh".
Although his six-syllable attempt at the surname was blatantly incorrect, Barkley also missed on Valanciunas's first name.
According to an NBA pronunciation guide published on Sportando.net, the correct pronunciation is: "YO-nahs vah-lahn-CHEW-nahs".
Valanciunas, 21, is averaging 10.8 points and 8.7 rebounds in his second season for the Raptors.