Who is Adolf Schicklgruber?

If you are referring to Adolf Hitler and whether he had the surname Schicklgruber, the answer is that Adolf Hitler's father, Alois had the surname Schicklgruber originally, but he chaned his surname to Hitler 13 years before Adolf was born, so there was never a Adolf Schicklgruber who became Adolf Hitler. Adolf Hitler was called Adolf Hitler from birth.

Adolf Hitler was born on 20 April, 1889 in Braunau am Inn, Austria. His parents were Alois Hitler and Klara Hitler (nee Pölzl). Klara was his 3rd wife and his second cousin.

Alois Hitler was born on 7 June 1837 as the illegitimate son of Anna Maria Schicklgruber and Johann Georg Hiedler. He went by the name of Alois Schicklgruber until he was 39, when, in 1876, his uncle, Johann Nepomuk Hiedler, included him in his will on the condition that he change his name to Hiedler. As a result of dialectic variations the name change was recorded in the church registry of the parish of Döllersheim on 4 June 1876 as Alois Hitler.

On 6 January 1877, the name change was officially confirmed and Alois Schicklgruber became Alois Hitler, which secured him his share of the inheritance.

In the 19th Century there were several variations of the name in Austria: Hüttler, Hiedler, Hittler and Hitler depending on region and dialect and all variations were pronounced more or less the same. It is accepted that the variations are derived from Hütte (hut) and was probably used to refer to a peasant or small holder.

As to why Alois Hitler did not correct this mistake and ensure that his new surname was correctly recorded as Hiedler is debatable. Journalist and histororian Wolfgang Zdral wrote in his book The Hitlers: "[Alois] probably liked the idea that he could distance himself from his ancestry with this variation. As "Hitler" he would begin a new branch of the family tree and as a dynastic progenitor he would found his own clan".