The Spanish word 'chantaje' (meaning 'blackmail') comes from the French word 'chantage', which has the same meaning. The French term was formed by combining the verb 'chanter' ('to sing') with the noun suffix '-age'. The verb 'chanter' itself derives from Latin 'cantare', meaning 'to sing'.

Interestingly, the connection between singing and blackmail comes from criminal slang. In 19th century France, criminals would threaten to 'sing' (reveal compromising information) about their victims unless they were paid to keep quiet. This metaphorical use of 'singing' as revealing secrets eventually led to 'chantage' meaning blackmail, and this meaning was borrowed directly into Spanish as 'chantaje'.

Some related Spanish words that might be familiar to Spanish learners include 'cantar' (to sing), 'canto' (song), and 'cantante' (singer). These words all share the same Latin root 'cantare' (to sing), though they maintained the original meaning related to musical performance rather than taking on the metaphorical meaning of revealing secrets that led to 'chantaje'.

English speakers might recognize the connection to words like 'chant', 'enchant', and 'chanty' (a sailor's work song), which all come from the same Latin root 'cantare' through French. Other related English words include 'cant' (a type of specialized jargon or hypocritical talk) and 'canto' (a division of a long poem). Like the Spanish cognates, most of these English words maintained meanings related to singing or speaking, rather than following the metaphorical path to blackmail that 'chantaje' took.