Alexius is the Latinized form of the given name Alexios (, polytonic , "defender", cf. Alexander), especially common in the Byzantine Empire. The female form is Alexia () and its variants such as Alessia (the masculine form of which is Alessio) in Italian. The surname Lex derives from Alexius.
The name belongs to the most ancient attested Greek names (a-re-ke-se-u in the Linear B tablets KN Df 1229 and MY Fu 718).
Rulers Alexios I Komnenos (1048–1118), Byzantine emperor Alexios II Komnenos (1167–1183), Byzantine emperor Alexios III, Byzantine emperor Alexios IV, Byzantine emperor Alexios V Doukas, Byzantine emperor Alexios I of Trebizond, Emperor of Trebizond Alexios II of Trebizond, Emperor of Trebizond Alexios III of Trebizond, Emperor of Trebizond Alexios IV of Trebizond, Emperor of Trebizond Alexios V of Trebizond, Emperor of Trebizond Alexius Mikhailovich (1629–1676), Tsar of Russia Alexius Petrovich (1690–1718), Russian tsarevich
Religious figures Alexius, Metropolitan of Moscow (1354–1378) Patriarch Alexius I of Constantinople (1025–1043) Alexius (c. 1425–1488), Russian archpriest who converted to Judaism Patriarch Alexius I of Moscow and All Russia (r. 1945–1970) Patriarch Alexius II of Moscow and All Russia (r. 1990–2008) Alexius of Nicaea, metropolitan bishop Saint Alexius of Rome, fifth-century eastern saint
Other Alexios Apokaukos, Byzantine statesman Alexios Aspietes, Byzantine governor Alexios Branas, Byzantine general Alexios Halebian, American tennis player Alexius Meinong, Austrian philosopher Alexios Mosele (Caesar), Byzantine heir-apparent Alexios Palaiologos (despot), Byzantine heir-apparent Alexios Philanthropenos, Byzantine general Alexios Raoul (protovestiarios), Byzantine general Alexios Strategopoulos, Byzantine general Alexios Xiphias, Byzantine Catepan of Italy Alexios (Assassin's Creed), a fictional character in Assassin's Creed: Odyssey
Alexius in other languages English – Alexis, Aleck German – Alexius, Alexis Greek – Αλέξιος [Alexios], Αλέξης [Alexis] French – Alexis Italian – Alessio Spanish – Alejo, Alexis Portuguese – Aleixo Latvian – Alexius, Aleksis, Aleksejs Polish – Aleksy Czech – Aleš, Alexej Slovak – Aleš Estonian – Aleksei Bulgarian – Алексей [Aleksej] Serbian – Aleksa Finnish – Aleksi, Aleksis Macedonian – Aleksio Georgian – ალექსი, [Aleksi ] Belarusian – Аляксей [Alaksiej, Aliaksiej, Alyaksyey] Russian – Алексей [Alexei, Alexey, Aleksei, Aleksey], Алексий [Alexiy], Алёша [Alyosha], Лёша [Lyosha] Ukrainan – Олексій [Oleksii, Oleksiy, Olexij], Олекса [Oleksa, Olexa] Hungarian – Elek
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