This is the 7223rd most frequent Polish word.
jelena
"Jelena" is not a Polish word; it is a Slavic female given name.
Here, 'jelen' (plural 'jeno') refers to a deer, a type of animal.
W lesie widziałem ślicznego jelena.
In the forest, I saw a beautiful deer.
In this case, 'jelenia' is the accusative singular form of 'jelen' when used as the direct object of the sentence.
Jelenia, którą namalowałeś, jest wyjątkowo realistyczna.
The deer you painted is exceptionally realistic.
'Jelena' as a proper noun is a name used in some Slavic contexts.