Usain Bolt is not letting that surname of his go to waste -- especially as it pertains to his kids ... including the two latest additions to his family, who've got names that really lean in.
The Jamaican track star rolled out a bit of a Father's Day surprise Sunday, taking to IG to post a photo of his brood -- including his GF, Kasi Bennett, his daughter, Olympia Lightning ... and newborn twins, who go by Saint Leo Bolt and Thunder Bolt. One big Bolt-y family!
The two new kiddos kinda come as a surprise -- as it doesn't appear many people knew he and Kas were expecting.