WE ARE HAPPY FOR THE CURIOUCITY YOU HAVE. THE NAMES OF THE UPANISHADS CAME IN DIFFERENT WAYS. SOME CAME BY THE FIRST WORD THEY HAVE VIZ., I:SA, KE:NA ETC., SOME NAMES CAME BY THE PERSONS CHANTED THOSE PARTS OF THE VEDAS. KATTHA AND CHHANDO:GYA NAMES CAME LIKE THAT. THE PART OF SA:MA VE:DA, WHICH WAS CHANTED
AND PROTECTED FROM GENERATIONS TOGETHER BY ORAL TRADITION, BY THE SCHOLARS CALLED ‘CHHANDO:GAS’, BECAME ‘CHHANDO:GYO:PANISHAD’. HENCE, THIS NAME CAME AFTER THE SCHOLARS WHO WERE CHANTING IT.
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