The Spanish word 'rinconcito' means 'little corner' and has an interesting Arabic origin. It comes from the Spanish word 'rincón' (meaning 'corner') combined with the diminutive suffix '-ito'. The word 'rincón' itself can be traced back to Andalusi Arabic 'rukán', which came from Classical Arabic 'rukn', both meaning 'corner' or 'nook'. When Arabic-speaking Moors ruled parts of Spain during the Middle Ages, many Arabic words entered the Spanish language, and 'rincón' is one such example. The diminutive suffix '-ito' was added to create the affectionate or smaller form 'rinconcito'.

This etymology shows how Spanish vocabulary has been influenced by centuries of Arabic presence in the Iberian Peninsula, while also demonstrating the common Spanish practice of using diminutive suffixes to modify meaning.

The most obvious related Spanish word is 'rincón', which simply means 'corner' without the diminutive meaning. This is a more common and basic word that you'll encounter frequently in Spanish. You might hear it in phrases like 'el rincón de la habitación' (the corner of the room) or 'en un rincón' (in a corner).

While there aren't any common English words directly related to 'rinconcito' or 'rincón' (since they come from Arabic rather than the Latin roots that English and Spanish often share), English has borrowed some architectural terms from Arabic that are distant cousins of this word. However, these borrowed terms are quite specialized and not commonly used in everyday English.