Meaning and Name Origin
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): from the Latin form of the Greek name Alexandros. Alexei is also a form of Alexis (Greek): often used as a short form of Alexander, though it is from Alexius, the Latin spelling of the Greek Alexios. 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)
Below is a graphed comparison of the popularity of the boy name Alexei and associated names. Prominent alternative forms of Alexei (#unlisted) listed in the Top 1000 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 the year 1999 and are somewhat less popular today, 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. (2014 Birth Statistics)