The Spanish word 'coquito' comes from combining 'coco' (meaning 'coconut') with the diminutive suffix '-ito'. The base word 'coco' itself comes from Portuguese 'côco', which originally had the dual meaning of 'ghost' or 'coconut' - the coconut was named this way because the three marks on the coconut shell resembled a ghost-like or goblin-like face.

The diminutive suffix '-ito' is commonly used in Spanish to indicate something small or endearing, so 'coquito' literally means 'little coconut'.

The most obvious related Spanish word is 'coco', meaning 'coconut', which is much more commonly used. You might also encounter this word in compounds like 'agua de coco' (coconut water) or 'leche de coco' (coconut milk).

While English 'coconut' is not directly related (it comes from Portuguese 'coco' through a different path), English has borrowed some related words like 'coco' in some contexts, particularly in product names or when referring to coconut-derived ingredients.