In 2018, 10 is the most common age for an American (U.S.) Seth who is registered male with the Social Security Administration. It is the 370th most common male first name for living U.S. citizens.
― Anonymous User 10/19/2018
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Seth used to be a common choice for sons born after the death of an older sibling--as Seth was born after the death of Abel. The Puritans were quite fond of this practice.