Etymology

Hai-men

Mandarin 海門 /海门
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The story

  1. Mandarin · borrowed from海門 /海门
  2. English todayHai-men

From Mandarin 海門 /海门 (Hǎimén) Wade–Giles romanization: Hai³-mên².

Etymology from Wiktionary, CC BY-SA 4.0.