Rojahn is a surname. Notable people with the surname include:
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Birgitte Cornelia Rojahn ( Gulbrandsen; 1839–1927), Norwegian stage actress, concert singer and voice trainer, wife of
Ferdinand A. Rojahn (1822–1900), German musician, organist, violinist and conductor
Also
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Ernst Rojahn (1909–1977), Norwegian chess player
See also
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Rojan (disambiguation)
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