This is the 608th most frequent Armenian word.
հովհաննես
The Armenian word "հովհաննես" translates to "Hovhannes," a male given name equivalent to "John" in English.
In this sentence, 'Հովհաննես' is used as a proper noun, being the name of a person who is going to school.
Հովհաննեսը գնում է դպրոց։
Hovhannes goes to school.
Here, 'Հովհաննեսի' is the genitive case of the name 'Հովհաննես', indicating possession or association that we had a conversation with Hovhannes.
Մենք խոսեցինք Հովհաննեսի հետ։
We talked with Hovhannes.
In this context, 'Հովհաննեսին' is the dative case of the name 'Հովհաննես', showing that the book was dedicated to him.