This may have already been realized by some profile managers who include both a Dr. Siegfried Hoitasch and a Dr. Frederick John Hoitasch (with the same birthdate) as children of Moritz and Rosa Hoitasch. However, most profiles include both names as if they are separate individuals, and this confused me until I acquired a lot of data that show that they are the same person, and moreover, they are the same person as the "Viteslav" child of Moritz and Rosa in historical writing.
Here are the data:
The history of the Jews of Vseruby (published in 1934) lists the Moritz and Rosa Hoitasch as a Jewish family with "Children: Mína, Klára, Vítězslav, Gustav, Berta, Emma." There is no mention of a Siegfried, though Siegfried was born in 1883, before Gustav.
That same historical article mentions that Dr. Siegfried Hoitasch served in the Great War as a battalion medical officer.
In 1901, the death notice for Moritz lists all the same children as in that article except that Viteslav is missing and Siegfried is in the list.
The 1910 medical diploma for Dr. Frederick John Hoitash of Huntington West Virginia (USA) which as handed down to Charles F. Hoitash and his children, shows the name of Siegfriedum Hoitasch and that the recipient was from Neumark Bohemia. (The entire diploma is in latin.)
US immigration records from November 1922 show that one Viteslav S. Hoitasch from Neumark, Czechoslovakia, with mother Rosa Hoitasch and listing physician as his occupation, arrived in the USA at Ellis Island with final destination listed as Ashland, Kentucky.
Frederick John Hoitash of Huntington West Virginia (located very near Ashland Kentucky) is shown on the US 1930 census, as being a naturalized US citizen married to Agnes who was at that time not a us citizen, and also being a eye doctor. The age listed on the April census (46) is consistent with birth in June 1883.
Both the death certificate and US draft registration card (for WW2) show a birthday for Frederick John Hoitash of June 26, 1883 and birthplace of Neumark, Czechoslovakia, and parents as Bernard Hoitasch and Rosa Langschur.
On the death notice for his mother Rosa Hoitasch (Langschur) in 1928, he is listed as Frederick (and Agnes) Hoitash, and there is no listing for Siegfried.
Analysis:
Though many important documents are not yet found to help prove this case, it appears that the first name of Viteslav was no longer commonly used by him by 1901, though he was listed that way on the list of Vseruby Jewish households "after 1860". The time of his father's death when he was 18 years old, he had adopted the use Siegfried as is first name and it is Siegfried, rather than Viteslav, that is listed as one of Moritz's children on his death record. The use of Siegfried continued through his receipt of his medical diploma in 1910 and his service in the Army medical corp during World War I.
For his travel to live in the US, he listed himself as Viteslav S. Hoitasch (perhaps because that is what his passport indicated.) All current records from November 1922 on show his name as Frederick (or just Fred) John Hoitash, though the clearly indicate his parents names, birthday, birthplace, and occupation consistent with Dr. Siegfried Hoitasch.
While the change from Siegfried to Fred (or Frederick/Friedrich) makes perfect sense, there is no simple explanation for why Viteslav was dropped and why John was adopted as a new middle name.
