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Melvil Dewy
Melvil Dewey created the Dewey Decimal system. It is a classification system used by libraries, and not what is meant in the question. The decimal number system is the number system that we all use on a daily basis; it was invented by a succession of Arab and Hindu mathematicians beginning about 1400 years ago.
Mathematicians in ancient India s invented the decimal system around in the 9th century CE. It was later adopted by Persian and Arabic mathematicians and spread to the western world by the High Middle Ages.
It was developed in 1876. SO WAS UR NAN
The decimal point was invented by John Napier.