This is the 17th most frequent Japanese word.
さん
A polite honorific suffix meaning "Mr.", "Ms.", or "Mrs."
Here, 'さん' is used as a respectful title after the surname 'Yamada' to address or refer to someone politely, regardless of gender.
山田さんは学生です。
Mr./Ms. Yamada is a student.
Here, 'さん' is affectionately attached to the name of a cat, 'Mimi,' showing a playful or respectful personalization commonly used for animals or loved ones.
猫ちゃんに”ミミさん”という名前をつけました。
I named the cat Mimi-san.
In this sentence, 'さん' is referenced as the polite title itself, demonstrating awareness of its proper contextual usage, as 'san' is typically not used with certain professions or roles, like 'teacher'.