This is the 7776th most frequent Japanese word.
吉孝
"吉孝" is a Japanese given name, typically male, meaning "good fortune" (吉) and "filial piety" or "respectful conduct" (孝).
Name of the person in the sentence.
吉孝は私の友達です。
Yoshitaka is my friend.
Referring to the possession of the opinion by Yoshitaka.
吉孝の意見には賛成です。
I agree with Yoshitaka's opinion.
Indicating action performed by Yoshitaka, suggesting a method.