AHOY (AHOJ)
Miriam Webster:
Main Entry: hoy
Pronunciation: 'hoi
Function: interjection
Etymology: Middle English
Date: 14th century
-- used in attracting attention or in driving animalsAlexander Graham Bell suggested Ahoy as a greeting for his new invention, the telephone. (It didn't stick. The last remaining person to use it is Monty Burns, on The Simpsons.)
Plus ~10 million Czechs