This is the 419th most frequent Hungarian word.
lány
Girl.
Here, 'lánya' is the possessive form of 'lány', indicating the subject is 'his daughter'.
Az ő lánya ma sokat tanult.
His daughter studied a lot today.
In this sentence, 'lányt' is the accusative form of 'lány', pointing to the direct object of the action 'saw'.
A parkban egy lányt láttam táncolni.
I saw a girl dancing in the park.
Here, 'lányok' is the plural form of 'lány', denoting more than one girl.