Leonid Kulik was born on 1883-08-19.
Leonid Kulik died on 1942-04-24.
Yes, Leonid Kulik is a noun, a propernoun, the name of a person (noted Russian scientist). A proper noun is always capitalized.
Stephen Kulik was born in 1956.
Ivan Kulik was born in 1897.
Johann Kulik was born in 1800.
Marina Kulik was born in 1936.
Vasiliy Kulik was born in 1956.
Eran Kulik was born in 1946.
Oleg Kulik was born in 1963.
Ilia Kulik was born on May 23, 1977.
Vladislav Kulik was born on 1985-02-27.
Christian Kulik was born on 1952-12-06.