The announcer in the video below always says ‘Ohtani san‘ when Ohtani hits a home run.
san is さん in Japanese, which is put after people’s name to show respect to them. The name can be either surname or first name.
Example
かとうさん Mr Kato
かとう is a popular Japanese surname.
たかしさん Takashi
たかし is a popular first name for Japanese boys.
Suffix to show respect
【Japanese vocabulary: suffix after person’s name】 くん (kun)、さん (san)、ちゃん (chan)
くん is for boys and ちゃん is for girls. What about さん and さま? Let's check them out.
jpn.matome1.com