The surname Arnow is derived from a proud symbol of ancient Jewish culture. Before the late Middle Ages, people were known only by a single name. However, as the population increased and travelers set out on their journeys, it became necessary for people to adopt a second name to identify themselves. Jewish hereditary surnames were adopted from a variety of different sources. Two of the most common types of Jewish family names are patronymic surnames, which are derived from the father's given name, and metronymic surnames, which are derived from the mother's given name. The surname Arnow is a patronymic surname, which comes from the Hebrew given name Aharon. Traditionally, this surname is believed to have derived from the Hebrew word har-on, which means mountain of strength.
Migration of the Arnow family
Analysis of immigration records indicates that some of the first North American immigrants bore the name Arnow or a variant listed above:
Contemporary Notables of the name Arnow (post 1700)
Winston Eugene Arnow (1911-1994), American politician, U.S. District Judge for the Northern District of Florida, 1967-81 
Thomas C. Arnow, American Republican politician, Candidate for New York State Assembly from Bronx County 6th District, 1924 
Charles S. Arnow, American politician, Member of Georgia State Senate 4th District, 1923-24 
Arthur Arnow, American Republican politician, Candidate for New York State Assembly from Kings County 6th District, 1909, 1922, 1923