Kasayan that is my lastname. In tagalog language in the Philippines there is "kasaysayan" this means history; the central part of the country or the Visayan region has "kasayang" meaning "what a waste."
The "KASAYAN" word do not actually mean anything when you search through Google you may find "kasayang" or "kasaysayan" but these words are totally different in meaning.
"KASAYAN" could may be an Armenian name since it started with K and ends with "YAN" most Armenian names are like this format.