This is the 499th most frequent Finnish word.
juha
"Juha" is a Finnish male given name.
'Juha' is used as a proper noun, the name of a person, functioning as the subject of the sentence.
Juha auttaa Mariaa.
Juha is helping Maria.
'Juhalta' is the elative case of the name Juha, indicating the source or from whom the action (buying) occurred.
Ostin kirjan Juhalta.
I bought a book from Juha.
In this sentence, "Juha" is used as a proper noun, specifically a personal name.