兄ちゃん

Japanese

Of 兄 (nii, “older brother”) +‎ ちゃん (-chan), a childish variant of the honorific -さん.^[1]

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兄(にい)ちゃん • (nī-chan)

(familiar, term of address) (one's own) elder brother
- ねぇ、兄(にい)ちゃん、聞(き)いて
  nē, nīchan, kīte
  oh, bubby, listen to me
(familiar or informal) boy; lad; chap
- 1991 March 15, Rumiko Takahashi, “ＰＡＲＴ(パート).10(じゅう)　そして拳(けん)印(いん)は消(き)えた [Part 10: The Mark’s Finally Gone]”, in らんま½ [Ranma ½], volume 14 (fiction), Tokyo: Shogakukan, →ISBN, page 162:
  
  よっ　ええぞ　にいちゃん。
  Yo' ē zo nī-chan.
  Woo, you damn fine, boy.

Of 兄 (ani, “older brother”) +‎ ちゃん (-chan), with sound shift from ani to an.^[2]

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兄(あん)ちゃん • (anchan)

(familiar, informal, term of address) (one's own) older brother
(familiar, informal) a young man, boy, lad
近所(きんじょ)の兄(あん)ちゃん
kinjo no anchan
young fellow from the neighborhood
(informal) a playboy, a libertine young man
(regional, Chita peninsula, Aichi Prefecture) son; eldest son^[1]
(regional, Sado island, Niigata Prefecture) (one's own) husband^[1]

↑ ^1.0 ^1.1 ^1.2 Shōgaku Tosho (1988) 国語大辞典（新装版） [Unabridged Dictionary of Japanese (Revised Edition)] (in Japanese), Tōkyō: Shogakukan, →ISBN
^ 2004. “兄ちゃん” in Kenkyūsha's New Japanese-English Dictionary, fifth edition. Tokyo: Kenkyūsha.