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Jermaine Jackson

Jon Furniss/WireImage.com

Call him the Jacksun One.

Michael Jackson's brother Jermaine has successfully changed his famous surname to Jacksun, according to court documents obtained by E! News.

A court commissioner signed off on the 58-year-old singer's petition today, officially making him Jermaine LaJuane Jacksun.

The fourth-eldest of Katherine and Joe Jackson's sprawling brood has not yet commented since the switch became legal, but a spokesperson for Jermaine told us back when he first filed his petition in November that his decision to change one letter of his last name was "a personal choice" and "not a big deal."

The news comes a day after Cirque du Soleil revealed that its newest Michael Jackson-inspired show will be called Michael Jackson ONE and is set to begin preview performances May 23 at Mandalay Bay Resort and Casino in Las Vegas.