One of the mysteries of the English language finally explained.
A nickname for: Wilhelm I, emperor of Germany (1871–88), or (usually) Wilhelm II, emperor of Germany (1888–1918). Now historical.
Late 19th century; earliest use found in Morning Republican (Little Rock, Arkansas). From Kaiser + Bill, pet form of the male forename William, after the names of Kaiser Wilhelm I, emperor of Germany 1871–88, and Kaiser Wilhelm II.
Kaiser Bill/ˌkʌɪzə ˈbɪl/
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