The Spanish word 'bumerán' comes from English 'boomerang', which itself was borrowed from the Aboriginal Australian Dharug language word 'womera', meaning 'throwing stick'. The Dharug word was adapted into English as 'boomerang' specifically referring to the curved throwing stick that returns to the thrower, and this meaning was then borrowed directly into Spanish.

Since 'bumerán' entered Spanish directly from English in relatively recent times, there aren't any simpler or more common etymologically related Spanish words to help with learning this term.

The English word 'boomerang' is obviously related to Spanish 'bumerán', as it's the direct source of the Spanish word. English speakers can easily remember the Spanish word by noting that it's essentially the same word with Spanish spelling conventions (changing 'oo' to 'u' and 'g' to 'án'). The word has also taken on a figurative meaning in both languages, referring to an action that returns to affect the person who initiated it, as in 'his lies boomeranged on him' / 'sus mentiras le bumerán'.