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Ritchie Blackmore's birth name is Richard Hugh Blackmore.
Susan Blackmore's birth name is Susan Jane Blackmore.
Yes. Jurgen Blackmore's the only one I know of, but there may be more.
He also has a daughter, Autumn Esmeralda, aged 1 in 2011
Leigh Blackmore was born in 1959.
Selwyn Blackmore was born in 1972.