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Khloe Kardashian<\/a> and <\/span>Tristan Thompson<\/a> have made their son’s name change official. More than a year after the former couple <\/span>welcomed their son<\/a>, Tatum, via surrogate, his last name is officially Thompson.<\/span><\/p>\n After staying mum about Tatum’s name for the first several months of his life, his moniker <\/span>was revealed<\/a> during an episode of\u00a0<\/span>The Kardashians<\/em><\/a>. Around the same time,\u00a0<\/span>TMZ<\/em>\u00a0reported<\/a> that Khloe initially gave her son Kardashian as his legal last name. The outlet’s sources said Khloe eventually decided to change his name to Tatum Thompson.<\/span><\/p>\n “When a baby is born and a name has not been chosen, something still must be submitted to the state, and the state will make a birth certificate for ‘baby\u2019 with the mother’s last name if the couple is not married,” a source told ET at the time. “Since then, Khloe and Tristan’s son’s name was legally made Tatum Thompson.”<\/span><\/p>\n That name change became legally official on Thursday when a Los Angeles county judge granted the request, according to docs obtained by ET.\u00a0<\/span><\/p>\n The subject of her son’s inception and birth has been difficult for Khloe, who <\/span>previously claimed<\/a> that\u00a0Tristan\u00a0“encouraged” her to do the embryo transfer\u00a0days before the news broke that he had fathered another child with Maralee Nichols amid their engagement.<\/span><\/p>\n