The story
From the Postal Romanization of Cantonese 三水 (saam¹ seoi²), when the initial of the second syllable was still [ɕ] during the late 19th and early 20th centuries.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: Synonym of Sanshui: the Cantonese-derived name. Full definition →
From the Postal Romanization of Cantonese 三水 (saam¹ seoi²), when the initial of the second syllable was still [ɕ] during the late 19th and early 20th centuries.
Etymology from Wiktionary, CC BY-SA 4.0.