Analysis of information sources in references of the Wikipedia article "Princess Claire of Belgium" in English language version.
Claire heet nu 'Claire Coombs', haar meisjesnaam. ... [Claire is now called 'Claire Coombs', her maiden name.]
Under Belgian law, marriage does not have any effect on the spouses' surnames. You keep the surname that you had before you were married.
la Princesse Claire Coombs, Princesse de Belgique.
Claire heet nu 'Claire Coombs', haar meisjesnaam. ... [Claire is now called 'Claire Coombs', her maiden name.]
Under Belgian law, marriage does not have any effect on the spouses' surnames. You keep the surname that you had before you were married.
la Princesse Claire Coombs, Princesse de Belgique.