BeyoncéとJay-Zは双子の名前のRumiとSir
情報源: Beyoncé and Jay-Z file trademark on twin names Rumi and Sir | Music | The Guardian
コメント：記事によると、ビヨンセとJay-Zの双子の名前は、ルミ(Rumi)とサー（Sir）とのことで、５歳のBlue Ivyと同じアドレスで６月２６日に出願されているとのことです。
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