Yes, Leonid Kulik is a noun, a propernoun, the name of a person (noted Russian scientist). A proper noun is always capitalized.
Leonid Kulik died on 1942-04-24.
Leonid Kulik was born on 1883-08-19.
Ilia Kulik's birth name is Ilia Alexandrovich Kulik.
Buzz Kulik's birth name is Kulik, Seymour.
Elizaveta Kulik's birth name is Elizaveta Ilinichna Kulik.
Valentin Kulik's birth name is Valentin Yakovlevitch Kulik.
Yuri Kulik's birth name is Yuri Vladimirovitch Kulik.
Ilia Kulik is 5' 11".
Vasiliy Kulik died in 1988.
Vasiliy Kulik was born in 1956.
Eran Kulik was born in 1946.
Oleg Kulik was born in 1963.