Which NBA player wore No. 37 best? Kostas Antetokounmpo, the youngest of three Antetokounmpos to play in the NBA, wore No. 37 in his only two NBA games as a rookie on a two-way contract with the Dallas Mavericks last season. The Los Angeles Lakers claimed Kostas off waivers in July, presumably as a wink to brother Giannis, the NBA's reigning MVP and a 2021 free agent.