What is the word 'mister' when translated from English to Japanese?

The Word "san" or the more polite "sama" are added to names to signify respect in Japanese, more or less as we use the title "Sir" or "Mister" in English.

Improvement

"San" paired with the person's last name is a polite way to say "Mister". If you pair "san" with the person's first name, it is more casual.

"Sama" is only used for people who you respect highly or admire.

If the person you are addressing works under you or is lower than you, "kun" is appropriate. However, if they are equal to or higher than you, they might find you to be impolite or disrespectful.