In the Wade-Giles system of romanization, it is spelled as "Hsu", which is commonly used in Taiwan or overseas Chinese communities.

In Wu Chinese including Shanghainese, the surname 徐 is transcribed as Zee, as seen in the historical place name Zikawei in Shanghai (Xujiahui in Pinyin).

In Cantonese, 徐 is often transcribed as Tsui, T'sui, Choi, Chooi, Chui or even Tsua.

In modern Vietnamese, the character 徐 is written Từ and Sy when migrating to the English-speaking World, particularly the United States.

In Japanese, the surname 徐 is transliterated as Omomuro (kunyomi) or Jo (onyomi or Sino-Japanese).