The Spanish word 'que' comes from several related Latin words: 'quid' (meaning 'what' as a neuter pronoun), 'quem' (meaning 'whom' in the accusative case), 'quis' (meaning 'who' or 'which'), and 'quam' (meaning 'than' or 'as'). These Latin interrogative and relative pronouns merged over time to create the versatile Spanish word 'que', which can function as both a relative pronoun ('that', 'which', 'who') and a conjunction in modern Spanish.

Several common Spanish question words are related to 'que', including 'qué' (meaning 'what'), 'quién' (meaning 'who'), and 'cuál' (meaning 'which'). All of these words share the same Latin interrogative roots. The main difference is that 'que' (without an accent) is used for connecting clauses or as a relative pronoun, while 'qué' (with an accent) is used for questions.

While English is a Germanic language, it has borrowed many words from Latin through French. The English words 'query', 'question', and 'quest' are all distantly related to Spanish 'que', as they come from the same Indo-European root that gave rise to the Latin interrogative words. You can see how all these words share a connection to asking or seeking information.