This is the 4561st most frequent Japanese word.
幸生
"幸生" means "blessed life" or "happiness in life."
In this sentence, '幸生' is used as a proper noun referring to a person's name.
幸生は非常に親切な人です。
Yukio is a very kind person.
Here, '幸生' is again a proper noun, but it's associated with the meaning of 'fortunate living' due to its kanji composition.
彼の名前は幸生というが、とても幸運な人生を送っています。
His name is Yukio, and he leads a very fortunate life.
In this case, '幸生' is used as a concept, symbolizing happiness and life fortune inherent in its kanji meaning.