Sean

Actually there is not much evidence that Sean was used when people were speaking in English in Ireland itself until around 1900. The earliest example of a Sean born to American parents in the United States census was born in 1924.

In 2018, 20 is the most common age for an American (U.S.) Sean who is registered male with the Social Security Administration. It is the 123rd most common male first name for living U.S. citizens.

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In 2018, 22 is the most common age for an American (U.S.) Sean who is registered female with the Social Security Administration. It is the 4, 466th most common female first name for living U.S. citizens.

Another way to spell this is Saon, pronounced the same way. (However, I believe this is another Welsh variant.)

I always thought the name Sean/Shawn was an Irish name.