Brian

Also Dutch: https://nvb.meertens.knaw.nl/naam/is/Brian

Also Portuguese (Modern): https://www.behindthename.com/name/brian/top/portugal
https://www.behindthename.com/name/brian/top/brazil

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Also Spanish (Modern): https://www.ine.es/widgets/nombApell/index.shtml?L=1

Actually in northern England Brian was introduced by Norse settlers with connections to the Vikings who settled in Ireland. They adopted the name out of admiration for Brian Boru, even though he was their enemy, and brought it with them to Cumberland and Yorkshire in northern England before the Bretons came along with the Normans in 1066. [noted -ed]

Also used in Galician: http://www.ige.eu/igebdt/esq.jsp?idioma=gl&ruta=onomast/nomes.jsp
https://gl.wikipedia.org/wiki/Lista_de_nomes_masculinos_en_galego

In 2018, 38 is the most common age for an American (U.S.) Brian who is registered male with the Social Security Administration. It is the 23rd most common male first name for living U.S. citizens.