Regina Spektor is Russian, and the Russian system of middle names is patronymic, which means that her middle name is derived from her father's first name. Her father's first name is Ilya, and so her middle name is probably(?) Ilyinichna.
Hamilton Elementary School
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The name Raina (or Rayna) is Bulgarian and derived from the name Regina. Regina is a late Latin name meaning "queen". From early times, it was in use as a Christian name and it was used during the Middle Ages in England in honour of the Virgin Mary. In Canada, a city bears the name Regina, in honour of Queen Victoria.
Regina Resnik's birth name is Regina Resnick.
Regina Bianchi's birth name is Regina D'Antigny.
Regina Petrik's birth name is Regina Popp.
Regina Dias's birth name is Regina Stulman.
Regina Carrol's birth name is Regina Gelfan.
Regina Hooks's birth name is Regina Brown.
Regina Yanushkevich's birth name is Yanushkevich, Regina Vikentyevna.
Regina Whitcomb's birth name is Regina Ann Enzer.
Regina Bookasta's birth name is Regina Mary Rogers.