Based on documents signed by this family’s pioneering ancestor there is no doubt that the family names of Climenhaga and Climenhage (and the now defunct Climenhegg and Glimanhaga) were originally not spelled in any of these written forms. In fact, five instances of Henry Climenhagen’s signature state in no uncertain terms that his German surname was [Henrich] Kleimenhagen: 
It is just as apparent that ‘Climenhagen’ was the closest Anglicanized form of Kleimenhagen as this is the name that appears on five [known] documents pertaining to Henry including the land petition of Henry Clymenhagen (14 Jul 1797); the will of Abraham Boehm/Beam (18 May 1799) in which he names his ‘trusty friend’ Henry Clymenhagen as an executor of his will; the land sale between Parshall Terry and Henry Clymenhaggen (6 Dec 1799); the will of Martin Beÿer/Byer (13 Nov 1802) in which he names Henry Clymenhagen as an executor; and, the will of Henry Climenhagen (15 Dec 1804) in which he lists himself and his children as Climenhagen.
Based on the written consistency of the family name across Henry’s eight years in Upper Canada—from the date of his arrival to the date of his death in 1805—it is believed that, had Henry lived longer, this family’s surname would be Climenhagen. This belief is based also on the fact that another Kleimenhagen, [a probable distant relative of Henry’s] who also immigrated to Canada from Germany, went by Clemenhagen as do his descendants.
-  Land grant petition of Henry Clymenhagen, 14 Jul 1797;  Estate of Abraham Beam: Bond of Christian Vinecker (Winger) and Henry Climenhagen, 28 Dec 1799;  Estate of Abraham Beam: Oath of administration of Christian Vinecker and Henry Climenhagen, 28 Dec 1799;  Petition of Henry Climenhagen and Edward Carney for letters administration to effects Abraham Beam, 28 Dec 1799;  Last Will and Testament of Henry Climenhagen, 15 Dec 1804.(↵)
- Johann Christoph Kleimenhagen, born April 4th 1812 in Herrenbreitungen, Germany, came to Canada in 1853 first living in Berlin, Ontario (now Kitchener), Ottawa, and then Mulgrave Township near Buckingham, Quebec. He died March 1st 1883 at LaBlanceh, Mulgrave Township, Quebec.(↵)