Kaiser

''Kaiser'' is the German word for "emperor". Like the Bulgarian, Serbian and Russian word ''Tsar'', it is directly derived from the Roman emperors' title of Caesar, which in turn is derived from the personal name of the Julii Caesares, a branch of the ''gens'' (clan) Julia, to which Gaius Julius Caesar, the forebear of the Julio-Claudian dynasty, belonged. In general the German title was only used for rulers over the rank of kings (''König'').
Although the British monarchs styled "Emperor of India" were also called ''Kaisar-i-Hind'' in Hindi and Urdu, this word, although ultimately sharing the same Latin origin, is derived from the }} (''kaisar''), not the German ''Kaiser''.
In English, the term "the ''Kaiser''" is usually reserved for the emperors of the German Empire and the emperors of the Austrian Empire. During the First World War, anti-German sentiment was at its zenith; the term ''Kaiser''—especially as applied to Wilhelm II, German Emperor—thus gained considerable negative connotations in English-speaking countries. Still this title has high historical respect in German-speaking regions. Provided by Wikipedia