The Spanish word 'izquierda' meaning 'left' has an interesting origin that traces back to a combination of Basque and Celtic roots. It comes from the Basque word 'ezkerra' (meaning 'left'), which itself was formed from two elements: the Basque word 'esku' meaning 'hand' and a Celtic element 'kerros' meaning 'twisted'. This etymology suggests that the concept of 'left' was originally conceived as the 'twisted hand' or perhaps the 'awkward hand', reflecting historical attitudes toward left-handedness that were common in many cultures.

Unlike many Spanish words that have Latin origins, 'izquierda' stands out as one of the few words in Spanish that comes from Basque. Due to its unique origin, there aren't many simpler or more common Spanish words that share its etymology.

Since 'izquierda' comes from Basque and Celtic roots rather than the Indo-European roots that gave rise to most English words, there aren't any common English words that are etymologically related to it. This is a case where English and Spanish took completely different paths to express the concept of 'left' - English using Germanic roots and Spanish borrowing from Basque.