Claude Röcker was born in approximately 1784, probably in France. He served in Napoleon's army and fought against the Russians. He was captured by the Russians, and in 1812, was settled in the Volga German colony of Rohleder. He is recorded on the 1834 Census of Rohleder in Household No. 31 and on the 1850 Census of Rohleder in Household No. 49 along with a note that he had died there in 1845.
Some translations have given this surname alternate spellings: Rockar and Rockel among them.
- 1834 Census of Rohleder.
- 1850 Census of Rohleder.
- Belousov, S.V. "Prisoners of war of Napoleon's army in the Volga region: the arrangement, content, relationships with the local population." Bulletin of the Samara State University, No. 1 (Samara, Russia: Samara State University, 2006): 48-55.