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Bertha

fem. proper name, from Old High German Berahta, Perahta, the name of a goddess, literally "the bright one," from Old High German beraht "bright," related to Old English beorht (from PIE root *bhereg- "to shine; bright, white"). Soldiers' nickname Big Bertha for large-bore German mortar of World War I is a reference to Frau Bertha Krupp von Bohlen und Halbach (1886-1957), owner of Krupp steel works from 1903-43.