I now (believe I) have a clearer understanding of the derivation of the Kahn name.
The Cohens were an ancient Jewish tribe of priests, believed to be descendants of Aaron and entrusted by God with certain sacred rites within temples. Other tribes were, for example, Levy and Israel. Membership of the tribe came through the male line only, contrary to Jewishness which is passed down through the maternal line.
Hebrew has no vowels in the alphabet. Instead, vowels are indicated by accents or dots or small lines below the letter. Thus Cohen is written in Hebrew: kaf-hei-nun (although written right to left) translating to c-h-n.
To allow names to be written and understood in a non-Hebrew language, vowels replace the dashes, giving us Kahn, Kuhn or Kohn, as well as Cahen and Kahan. In fact, they are all variations of the same root name – Cohen.
In theory, all Kahns are descendants of the Kohanim, the priests. The Jewish priest is not to be confused with a rabbi. They complement each other. A rabbi is not required to be a kohein and a kohein can be a rabbi. The two religious roles perform different ritualistic functions within the Jewish faith.
Kohein graves often bear the symbols of the ‘blessing hands.’
This insight was courtesy of GB of cemeteryscribes.com. If you haven’t already, please take a look at this excellent website: www.cemeteryscribes.com