Hindus use rosaries; they are called mala. Buddhists use them too (what do Buddhists call them?). Muslims use them and call them subhah, tasbih, or misbahah (all from the same Arabic root s-b-H). Who doesn’t use rosaries? Jews, Shinto, and Wiccans?
Hindus and Buddhists use 108 beads. Muslims use 99 beads (there are compact versions with 33 or as few as 11 beads, or expanded ones with 1000). Some Sufi rosaries have a side string attached to the main one with 10 little beads, used for counting multiples of 100. Actually, the Muslim rosary has one big one at the end, making 100 if you count that. Catholics use, what, 55 beads? 5 Ave Marias and 5 Paternosters? It’s been so long since I was Catholic…
The name rosary, from Latin rosarium, originated as an Arabic pun. Muslims got the practice from Buddhists, and Christians got it from Muslims. In Arabic, the practice of reciting the rosary is called wird (from the root verb warada, meaning to go down to the water, related to the name of the Jordan River, from the Hebrew cognate yardan, from the Hebrew verb yarad). Wird happens to be spelled the same in the all-consonant Arabic alphabet as the word ward, ‘roses’ (a loanword from Old Persian). Idries Shah traced the origin of this pun and its transmission to Latin, in which the pun was lost, in his book The Sufis.