The Spanish word 'dinerito' meaning 'little money' comes from 'dinero' (money) with the diminutive suffix '-ito'. The word 'dinero' itself has an interesting history tracing back to Latin. It comes from the Latin word 'denarius', which was the name of a Roman coin worth ten 'asses' (a basic Roman monetary unit). The 'denarius' got its name from Latin 'deni' meaning 'each ten', which in turn comes from 'decem' meaning 'ten'. So the connection between money and the number ten has been preserved from ancient Rome to modern Spanish!

The most obvious related Spanish word is 'dinero' (money), which is simply the base word without the diminutive suffix '-ito'. The diminutive form 'dinerito' is often used to refer to a small amount of money, sometimes in an affectionate or informal way.

While English 'money' is not related to 'dinero', we do have some words that come from the same Latin root 'denarius'. The word 'denarius' gives us 'denier', a small French coin and unit of weight. We also see this root in 'denary' (relating to the number ten) and 'denarian' (containing ten parts). The symbol 'd' for British pre-decimal pennies also came from 'denarius'!