Namesakes
Notable Artists:
1 painter
Alexej von Jawlensky (a.k.a. Aleksey) 1864-1941 
Notable Explorers and Adventurers:
1 explorer
Aleksey Leonov 1934-2019
Olympic Medalists:
3 gold, 2 bronze, 1 silver
(silver) Aleksey Spiridonov 1976 hammer throw
(gold) Aleksey Kudryavtsev 1992 swimming - 4x200 m freestyle relay
(bronze) Aleksey Voyevodin 2004 50 km walk
(gold) Aliaksei Abalmasau (a.k.a. Aleksey) 2008 canoe sprint
(gold) Aleksey Obmochaev 2012 volleyball
(bronze) Aleksey Denisenko 2012 taekwondo
Other Royalty:
1 grand prince
Aleksey, Tsarevich of Russia 1904-1917 Russia
Russian Grand Dukes and Tsars:
1 tsar
Tsar Aleksey 1645-1676