The surname Claber turns up at beginning of the 18th. century in the Lower-Rhine area of Germany and in the south of the Netherlands in Limburg. Also in Hungary/Austria the name Klaber turns up in the 19th. century.
- Although there is a small village in North Germany, called Klaber (near Gustrow, Mecklenburg-Vorpommern), there are no indications people used Klaber being their hometown for their surname.
- Another possibility is the use of the name of a profession such as the Kleiber, a brick-layer or mason. However, Jews would not have been working in the mason profession as they were barred from this profession and that would make this origin of the name for Jews very unlikely.
- More plausible is the connection to the profession of haberdashery or klauben in German a way of making a living still left open to Jews who were not allowed to have one of the "protected" professions.
- It has been suggested that the clover plant (Klee in German and 'klaver in Dutch) could have been used for the name as the four leaf plant was a rarity and would bring luck.
- A very plausible possibility is the linkage to Jean-Baptiste Kléber, the Napoleonic general who freed the Lower-Rhine area of Germany and the south of the Netherlands and brought Freedom, Equality and Brotherhood to the masses. Many used the name Clabbers and a few Claber. Until today the name is used in Limburg, Netherlands and is unchanged since Napoleonic times. The Jews in the Lower-Rhine area in Germany changed the name into a more German way of writing: Klaber.