A Portuguese or Brazilian unit of currency, or a king in Portuguese and Brazilian contexts (archaic usage).
From Portuguese 'real' (royal), which comes from Latin 'realis' meaning 'relating to the king' or 'royal.' It became a monetary unit named after royalty.
The Portuguese coin 'real' was so successful and widely traded during the Age of Exploration that the word spread around the world—sailors and traders used it so much that 'real' became the standard word for money in many languages, and it's still the official currency of Brazil today.
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