泰斯 is a generic transliteration of names ending in '-ais' or '-ess' sounds — most famously the title character of Massenet's 1894 opera 《
泰斯》 (Thaïs), based on Anatole France's novel about a 4th-century Alexandrian courtesan. Also used for Hardy's heroine Tess (more commonly
苔丝 Táisī). Choose based on context.
