Russian given names are often taken from the names of saints, especially those from Eastern Orthodox tradition, which are often of Greek origin. In the last century traditional Slavic names have again come into use. See European names.
Russian names are normally written in the Cyrillic alphabet, the usual alphabet of the Russian language. When they are represented in the Latin alphabet (of English and other western European languages) they are transcribed, which can result in multiple spellings for a single name depending on the transcription. For example Дмитрий can be rendered Dmitriy, Dmitri, or Dmitrii.
The word name in Russian is имя (imya), plural имена (imena).
http://www.sca.org/heraldry/paul/ period Russian names
http://vse-imena.com/ in Russian
http://www.russievirtuelle.com/prenoms.htm in French
http://www.imena.org/name.html in Russian
http://www.devichnik.ru/9810/imia.html and http://www.devichnik.ru/9805/imia.html in Russian