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There two branches to this family, one are counts and the others are barons. Some in the family write the name with a k at the end and others do not use the K at the end. There is also a family in the USA who use the name Keyserling, but these are not related at their grandfather assumed the name on his arrival in the USA in the early 1900.
There is an open family website for the Keyserling (k)'s with some 5000 entries at www.keyserlingk.info
I am the webmaster, Alexander Graf Keyserlingk akeyserlingk@gmail.com