What language do 'octa' and 'hexa' and 'penta' come from?

The classical Latin and Greek languages are the sources of the prefixes 'octa-', 'hexa-', and 'penta-'. The prefixes respectively mean 'eight', 'six', and 'five'. They come into English by way of the Latin of the ancient Romans and by way of the even earlier Greek of the ancient Greeks.