This was once the standard abbreviation of Charles. It appears often in historical documents containing lists of people— a census or ship manifest, for example— alongside other abbreviations like Jno (John) and Hy (Henry).
Chas Tenenbaum, a financial whiz, is one of the three siblings in The Royal Tenenbaums.
― Anonymous User 10/17/2018
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In 2018, 21 is the most common age for an American (U.S.) Chas* who is registered male with the Social Security Administration. It is the 7, 049th most common male first name for living U.S. citizens. *as a first name, not a nickname.
― Anonymous User 10/15/2018
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I like this short for Charles. It's better than the overused Charlie.