The spelling of the word "Leishman" follows the phonetic transcription of /ˈliːʃmən/. The first syllable is pronounced as "lee" with a long "e" sound, followed by "sh" as in "shoe", and "mən" with a schwa vowel sound in the second syllable. This is a unique spelling that can be commonly found as a surname, which originated from a Scottish clan. The spelling of "Leishman" can cause confusion, as it is often misspelled as "Lishman" or "Leichman".
The name "Leishman" is of Scottish and English origin, derived from the Old English personal name "Leofsig" or "Lefsig". "Leof" means "dear" or "beloved" in Old English, while "sig" means "victory". Over time, the name went through various transformations, including "Leuescenus" in Latin and "Leysman" in Middle English before settling on its current form, "Leishman". As a surname, "Leishman" is thought to have originated as a patronymic name, indicating that the person was the son of someone named Leofsig or Lefsig.