'prop-2-en-1-yl' originates from 'propene', specifically the word 'prop-', where 'prop-' refers to a three-carbon chain, and 'en' indicates the presence of a double bond.

'propene' changed from 'propylene' and eventually became the modern chemical term 'propene'.

Initially, it meant 'a three-carbon alkene', but over time it evolved into its current meaning of 'a chemical group derived from propene'.