History:

Kadavarasaras spread likely involved people moving voluntarily and being forced to move. Voluntary moves might be because of better job prospects, marriage, or following trade routes. Forced moves might have been due to wars or political problems. This surnames wider presence is due to people moving and settling in new places. Where they settled depended on things like resources, society, and politics.

Description:

Common changes include shortening (like Kadavara), slight spelling tweaks (maybe Kadavasarra), or different spellings if it came from a different alphabet (perhaps Kadavasar). These are just ideas, though. To be sure, youd need a genealogy expert.