What does Alexei mean?
Alexei \a-lexei\ as a boys' name. Alexei's root is Greek, and the name Alexei means "man's defender, warrior". Alexei is a variation of Alexander (Greek). Alexei is also a form of Alexis (Greek). See also Olexei.
Alexei has 24 more alternative forms via Alexander, Alexis: Al▼, Alaster, Alec, Aleco, Alejo, Alek, Aleko, Aleksios, Aleksius, Alex, Alexan, Alexios, Alexius, Alexus, Alic, Alicio, Alick, Alik, Alister, Alistir, Alix, Allie▼, Lex and Lexo.
Alexei is an unusual first name for men. Alexei is an equally unusual surname for both adults and children. (2000 U.S. Census)
Prominent alternative forms of Alexei (#unlisted) are Al, Alec (#469 in 2014), Alek, Alex (#128), Alexander (#8), Alexis (#302) and Allie. These boy names reached the top of their popularity in 1999 (usage of 0.5283%) and are somewhat less popular today (usage 0.4419%, down 16.4%), with the versions Al and Allie becoming less stylish. Alec (#469), Alexander (#8) and Alexis (#302) are three of the more fashionable boy names here, with Alec and Alexander going through a revival in usage. Below is a graphed comparison of the popularity of the boy name Alexei and associated names. (Top 1000 Birth Names Statistics, 2014)