Meaning

noun Austrian physicist and philosopher who introduced the Mach number and who founded logical positivism (1838-1916)

origin* As a Polish, Czech, Slovak, Ukrainian, and Lower Sorbian surname, from pet forms produced by truncation of personal names beginning with Ma- such as Matej, Martin, or Maciej, and the addition of the Slavic suffix -ch. * As a Jewish surname, from German Mache (“work”). * Less commonly, a respelling of Hungarian Mács, a pet form of names corresponding to Matthew. * In some cases, from Vietnamese…

Etymology from Wiktionary, CC BY-SA 3.0