The Spanish word 'hazaña', meaning 'heroic deed' or 'feat', has an interesting mixed origin that reflects the historical contact between Arabic and Romance languages in medieval Spain. It comes from the Old Spanish 'fazaña', which was influenced by two different sources: the Andalusi Arabic word 'ḥasána' (meaning 'good deed'), which itself came from Classical Arabic 'ḥasanah', and the Old Spanish verb 'fazer' (meaning 'to do, to make'). The initial 'f' sound in 'fazaña' later evolved to 'h' in modern Spanish, a common sound change in Spanish's development, giving us the modern form 'hazaña'.

This etymology shows how the meaning evolved from the simple concept of a 'good deed' in Arabic to specifically mean a 'heroic deed' in Spanish, likely influenced by the action-oriented meaning of the verb 'fazer'.

The modern Spanish verb 'hacer' (meaning 'to do, to make') is related to 'hazaña' through their shared connection to Old Spanish 'fazer'. While 'hacer' maintained its general meaning of 'to do/make', 'hazaña' specialized to refer specifically to notable or heroic deeds.

While there aren't any directly related English words from the Arabic portion of the etymology, English words like 'fact', 'factory', and 'faction' are distantly related to 'hazaña' through the Latin root 'facere' (to do/make), which is also the ancestor of Old Spanish 'fazer'. These words all share the basic concept of 'doing' or 'making' something, though they've developed different specific meanings over time.