Andrei is a form of the Dutch, English, French, German, and Portuguese Andre.
Andrei is also an English, Russian, Romanian, Slavic, and Ukrainian spelling variant of the Czech, Slavic, and Russian Andrej and a Romanian, Russian, Slavic, and Ukrainian form of the English, Greek, and Russian Andrew.
Andrei is seldom used as a baby name for boys. It is not in the top 1000 names. Out of the group of boy names directly related to Andrei, Andrew was the most regularly used in 2015.
† Pronunciation for Andrei: AA as in "odd (AA.D)" ; N as in "knee (N.IY)" ; D as in "day (D.EY)" ; R as in "race (R.EY.S)" ; Y as in "you (Y.UW)" ; EY as in "ate (EY.T)"