Kaiser
A German surname from the word for “emperor,” ultimately borrowed from Latin Caesar.
The #1,039 most common surname in the United States (2010 Census) — about 1 in every 9,222 Americans shares it.
Etymology
Kaiser comes from German kaiser, meaning “emperor,” which itself goes back to Latin Caesar. The word passed into German very early and became the regular German title for an emperor. As a surname, it was likely first used as a nickname for someone who seemed regal, commanding, or linked in some way with imperial service or symbolism.
History
English surname writers noted forms like Kaiser, Cayser, and Keyser as early spellings connected with the title “emperor.” The name is especially common in German-speaking regions and later spread widely through migration to Britain, North America, and other English-speaking countries. In historical surname books it is often treated as a nickname rather than a hereditary noble title.
Origin
Regions
Variant spellings
Fun fact
Old surname dictionaries even glossed it simply as “the emperor,” showing how directly the name was tied to the imperial title.
From the historical record
“Diet. KAISER "I (Ger.) Emperor, Cssar [O.H.Ger. KAYSER J fejjwr = O.Sax. Usur = Goth. kaisar; all f. Lat, Caesar] 'Kaiser' is the oldest German word borrowed from Latin. Cp. Cayser in Diet. KAUFFMANN \ (Ger.) Merchant; Trades-”
— Surnames of the United Kingdom: a concise etymological dictionary (2 vols in 1)