Kazuya Souma

相馬一也, ソーマ・カズヤ
Kazuya Souma is the main male protagonist of Genjitsu Shugi Yuusha no Oukoku Saikenki series. He is an earthling who was summoned to another world as a hero but with the accurate announcement of the previous king Albert Elfrieden he became the King of Elfrieden Kingdom and to avoid rebellions of people thinking Kazuya has usurped the throne the king gives his daughters hand in marriage to Kazuya. Because Kazuya introduced himself to others using the Japanese form of familyname/surname first most people in the Kingdom think that Souma is his given name thus referring to him as King Souma. Only a few know that Kazuya is his givenname while Souma is his familyname. Source: Genjitsu Shugi Yuusha no Oukoku Saikenki Wiki