This is the 3343rd most frequent Japanese word.
敏之
"敏之" is a Japanese given name, typically male, meaning "敏" (sensitive, quick, clever) and "之" (of, from).
敏之 serves as a formal name, referring to a person in this sentence context.
敏之さんはスポーツが得意です。
Mr. Toshiyuki is skilled at sports.
敏之 is used as a possessive form referring to Toshiyuki's opinion.
私は敏之の意見に賛成します。
I agree with Toshiyuki's opinion.
敏之 refers directly to the name and discusses its reputation.