Hi Diane,
Have you visited the British archives on this website which shows they have original documents for the names listed which should show origins. There may be more people with modern day mis-spelling such as a 'k' instead of an 'h', etc, but I didn't insert a wildcard* to allow for this.
http://www.nationalarchives.gov.uk/catalogue/default.asp
HO 144/391/B20875
Nationality and Naturalisation: Scharlach, Fernando Louis Leonhard, from the United States of America. Resident in London. Certificate A8968 issued 30 April 1896.
HO 144/464/B32683
Nationality and Naturalisation: Scharlach, Siegmund Alexander, from Germany. Resident in London. Certificate A11762 issued 4 December 1900.
HO 144/69/99068
Nationality and Naturalisation: Scharlach, Robert Ernest, from Germany. Resident in Bradford. Certificate A3393 issued 14 January 1881.
Rena in England