The Spanish word 'perdón' (meaning 'forgiveness') comes from the Latin verb 'perdonare' meaning 'to forgive'. This Latin word was formed by combining two elements: the prefix 'per-' meaning 'completely' and the verb 'donare' meaning 'to give' or 'to donate'. So etymologically, to forgive literally meant 'to completely give' - perhaps in the sense of giving up one's right to be angry or seek revenge. The Latin 'perdonare' evolved into the Spanish verb 'perdonar', from which the noun 'perdón' was derived.

The Spanish verb 'donar' (meaning 'to donate') is a simpler related word, coming from the same Latin root 'donare'. While 'donar' retained the original meaning of giving or donating something, 'perdonar' and 'perdón' took on the more specific meaning of giving forgiveness.

The English words 'pardon' and 'donate' are cousins of 'perdón'. 'Pardon' came into English through French, but it ultimately traces back to the same Latin 'perdonare'. 'Donate' comes from Latin 'donare'. This helps explain why asking for a 'pardon' in English is similar to asking for 'perdón' in Spanish - they're essentially the same word that evolved slightly differently in each language.