ぼっちゃん

young master, little boy

noun Rare #35,348
young master, little boy Often used by a servant or staff member to address a boy in the household; it can also be a polite or affectionate way to refer to a little boy.
JA: ぼっちゃん、気をつけてくださいね。
EN: Be careful, young master.

お母さんがいなくてぼっちゃんも心細いことでしょう

You must be feeling a little lost without your mother, young master.

— Arrietty (2010)

あぁ確か大掃除の時に…ああっぼっちゃんケガはありませんか?

Oh, right, during the big cleanup… Oh! Young master, are you hurt?

— Arrietty (2010)

ぼっちゃん

Young master.

— Arrietty (2010)

ぼっちゃんちょっと失礼しますよ

Excuse me for a moment, young master.

— Arrietty (2010)

どうしたんですぼっちゃん…ああカラス!

What's wrong, young master...? Oh, a crow!

— Arrietty (2010)