| Gender | Male |
|---|---|
| Language | Greek |
| Other names | |
| See also | Alexia (female) Alexey |
Alexius is the Latinized form of the given name Alexios (Greek: Αλέξιος, polytonic Ἀλέξιος, "defender", cf. Alexander), especially common in the Byzantine Empire. The female form is Alexia (Greek: Αλεξία) and its variants such as Alessia (the masculine form of which is Alessio) in Italian.
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