This is the 4003rd most frequent Russian word.
константина
"Константина" is the feminine form of the name Constantine, meaning "constant" or "steadfast."
The word 'константина' is used here as the genitive case of the name Konstantin, showing possession or relation.
Константина пригласили на вечеринку.
Konstantin was invited to the party.
The word 'константина' is here in the genitive case again, indicating ownership.
Это книга Константина.
This is Konstantin's book.
The word 'константином' here is the instrumental case of the name, indicating the means or agency by or with which action is performed.