The Spanish verb 'renunciar' (to renounce) comes from the Latin 'renuntiare', which meant 'to renounce' or 'to give up'. The Latin word was formed by combining two elements: the prefix 're-' meaning 'back' or 'again', and 'nuntiare' meaning 'to announce' or 'make known'. So etymologically, to renounce something was to 'announce back' or 'declare against' something, effectively giving it up or rejecting it.

A related Spanish word is 'anunciar' (to announce), which comes from the same Latin root 'nuntiare' but without the 're-' prefix. Another related word is 'pronunciar' (to pronounce), which uses the prefix 'pro-' (forward) instead of 're-'. These words share the core meaning of making something known through speech or declaration.

English speakers can easily connect 'renunciar' to the English word 'renounce', which shares the same Latin origin. Other related English words include 'announce', 'pronounce', and 'announcement', all of which derive from the Latin 'nuntiare'. The connection between these words can be seen in how they all involve some form of formal declaration or statement.