Aleksey

Russian diminutives of Aleksey: Alekseyka (Алексейка), Alyokha (Алёха), Lyokha (Лёха), Alyosha (Алёша), Lyosha (Лёша), Alyonya (Алёня), Lyonya (Лёня), Alyoka (Алёка), Aleka (Алека), Lyoka (Лёка), Leka (Лека), Lyolya (Лёля), Alya (Аля), Alyunya (Алюня), Lyunya (Люня), Lekseyka (Лексейка), Leksa (Лекса), Leksya (Лекся), Lyoksa (Лёкса), Lyoksya (Лёкся)

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Russian patronymics of Aleksey: ♂ Alekseyevich (Алексеевич) and ♀ Alekseyevna (Алексеевна)

Given to 19 boys in America in 2014, some girls are given this name too in America but rarely.

I live in Russia and I can say that this name is widespread here. But now it's becoming less popular as 20-30 years ago.