Might as well be a nickname for cognates of Peter in other languages, when it becomes hard for English speakers to pronounce it such as Pietro, Pierre, etc.
In 2018, 51 is the most common age for an American (U.S.) Pete* who is registered male with the Social Security Administration. It is the 1, 167th 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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The name Pete was given to 62 boys born in the US in 2015.