This is the 119th most frequent Russian word.
человека
"Человека" is the genitive or accusative case of "человек," meaning "person" or "human" in English.
In this sentence, 'человека' is in the accusative case, derived from the nominative 'человек', and refers to 'a person' as the direct object of the verb 'встретил' (met).
Я встретил человека на улице.
I met a person on the street.
Here, 'человека' is in the genitive case, used to indicate possession or association, and 'у человека' translates to 'the person has'.
У человека есть семья.
The person has a family.
In this example, 'человека' represents 'a person' in the singular genitive case, governed by the preposition 'каждого' (every/everyone), indicating the rights belonging to each individual.