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Cognomen ウェルシュ (Welsh , Welsch , ウェルシュ) , all around the world, is a common last name. The last name ウェルシュ is habitual in Grenada, where it is quite a common surname, Guernsey, and New Zealand (explore the name in all countries). In absolute terms, the name is most common in the United States, the United Kingdom, and Germany.