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Kanji written in kana, with spaces between words.

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さん

Name suffixes: さん, くん, ちゃん, さま

What to put after someone's name, and never after your own.
要点The idea
Japanese puts a suffix after a name to show the relationship, and さん is the safe default for almost anyone.
SuffixUsed forFeel
〜さん~sanalmost anyone: colleagues, strangers, shop staffpolite, neutral
〜くん~kunboys, male friends and juniors (at work, a boss may use it for any junior, women included)friendly, a little familiar
〜ちゃん~chanchildren, close friends, family, petscute, affectionate
〜様(さま)さま~samacustomers, letters, very respected peoplevery formal
田中(たなか)たなかさん、 今(いま)いま 少(すこ)すこし いい です か?tanaka-san, ima sukoshi ii desu ka?Mr/Ms Tanaka, do you have a moment?
健太(けんた)けんたくん、 元気(げんき)げんき?kenta-kun, genki?Kenta, how's it going?
あやちゃん、 一緒(いっしょ)いっしょ に 帰(かえ)かえろう。aya-chan, issho ni kaerou.Aya, let's walk home together.
お客(きゃく)きゃく様(さま)さま、 こちら へ どうぞ。okyakusama, kochira e douzo.This way, please (to a customer).Staff address customers as お客(きゃく)きゃく様(さま)さま: you'll hear it in every shop.
A山田(やまだ)やまださん は 来(き)きます か?yamada-san wa kimasu ka?Is Yamada-san coming?
B山田(やまだ)やまだくん は 来(き)きます か?yamada-kun wa kimasu ka?Is Yamada-kun coming?Yamada is a boy or a younger man you know.
Same person, different relationship: さん keeps a polite distance; くん is for a boy, or a male friend or junior, and sounds familiar.

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