What is 'Clausen' when translated from Danish to French?

Fils de Nico is a French equivalent of the Danish name Clausen. The masculine singular noun, possessive preposition, and masculine diminutive (for Nicolas["Nicholas"]) may be rendered literally into English as "son of Nick." The pronunciation will be "feessd nee-ko" in northerly French and "feess duh nee-ko" in southerly French.