Adolf

Adolf (also spelt Adolph or Adolphe, Adolfo and when Latinised Adolphus) is a given name used in German-speaking countries, Scandinavia, the Netherlands and Flanders, France, Italy, Spain, Portugal and to a lesser extent in various Central European and East European countries with non-Germanic languages, such as Lithuanian Adolfas and Latvian Ādolfs. Adolphus can also appear as a surname, as in John Adolphus, the English historian. The female forms Adolphine and Adolpha are far more rare than the male ones.
The name is a compound derived from the Old High German "Athalwolf" (or "Hadulf"), a composition of "athal", or "adal", meaning "noble" (or "had(u)"-, meaning “battle, combat”), and "wolf". The name is cognate to the Anglo-Saxon name "Æthelwulf" (also Eadulf or Eadwulf). The name can also be derived from the ancient Germanic elements "Wald" meaning "power", "brightness" and wolf. 
Popularity and usage.
During the 19th and early 20th century, "Adolf" was a popular name for baby boys in German-speaking countries and to a lesser extent also in French-speaking countries (spelled there as "Adolphe"). Due to negative associations with Adolf Hitler, it has declined in popularity as a given name for males since the end of World War II. It remains common among men born before 1945. Adolf Dassler, the founder of Adidas, used his nickname, 'Adi', in his professional life and for the name of his company. Similarly, the French version, "Adolphe"—previously a fairly common name in France and the name of a classic French novel—has virtually disappeared, along with Italian "Adolfo".
However, the Spanish and Portuguese version, "Adolfo", has not become stigmatised in the same way. It is still in common use in Spanish- and Portuguese-speaking countries across the world.