Minecraft wiki entry for Mojang_Studios, associated text: Markus Persson and Rolf Jansson started development on massively multiplayer online role-playing game Wurm Online in 2003,[6] using the name Mojang Specifications.[7] Persson and Jansson incorporated their business under the name Mojang Specifications AB in 2007. Persson soon left and wished to reuse the name "Mojang"; Jansson renamed his company to Onetoofree AB, and later to Code Club AB.