For reference, 'shari' of Busshari (Buddha's ashes) originated from a word, zariira (शरीर), meaning 'body,' and the same Chinese characters applied to both words in Sanskrit when they were translated into Chinese.
ちなみに仏舎利の「舎利」は「肉体・遺体」を意味する単語シャリーラ(zariiraशरीर)であり、どちらもサンスクリットの漢訳に同じ漢字が宛てられたもの。