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In page Chiang Kai-shek:

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In 1912, when Chiang was in Japan, he started to use the name Chieh-shih (介石; Jièshí) as a pen name for the articles that he published in a Chinese magazine he founded: Voice of the Army (軍聲). Chieh-shih is the Wade–Giles romanization of this name, based on Standard Mandarin, but the most recognized romanized rendering is Kai-shek which is in Cantonese[2] romanization. Because the Republic of China was based in Guangdong (a Cantonese-speaking area), Chiang, who never spoke Cantonese but was a native Wu speaker, became known by Westerners under the Cantonese romanization of his pen name, while the family name as known in English remained Chiang.[citation needed]