This is the 7401st most frequent Japanese word.
伸也
"伸也" is a Japanese given name, typically masculine, meaning "extension" or "growth" (伸) and "also" or "to be" (也).
Here, '伸也' is used as a Japanese given name referring to an individual, followed by 'さん' as a respectful suffix.
伸也さんは、日本語を勉強しています。
Shinya is studying Japanese.
In this sentence, '伸也' is the proper noun indicating someone's name, directly identifying the person's name.
彼の名前は伸也です。
His name is Shinya.
'伸也' here functions as the subject of the sentence, providing the name of the person performing the action of working hard.