In 2018, 4 is the most common age for an American (U.S.) Edwin who is registered male with the Social Security Administration. It is the 346th most common male first name for living U.S. citizens.
The name Edwin is also frequently used in The Netherlands, and its pronunciation is the same as it is in English (ED-win). A well-known Dutch bearer of this name is the radio DJ Edwin Evers. [noted -ed]
Also German:
https://de.m.wikipedia.org/wiki/Edwin
https://forebears.io/forenames/edwin