This is the 8713th most frequent Japanese word.
昭雄
"昭雄" is a Japanese given name meaning "bright hero" or "shining male."
In this sentence, the word '昭雄' is used as a proper noun, representing a person's name, in this case, Mr. Akio.
昭雄さんはとても親切な人です。
Mr. Akio is a very kind person.
Here, '昭雄' again is used as a proper noun, specifying the name of the individual being referred to.
彼の名前は昭雄です。
His name is Akio.
In this context, '昭雄' is mentioned as a proper noun in the form of a name historically present in Japan.