The spelling of the word "Marquus" is not commonly used in English, but it is pronounced as "mahr-kwuh s". This word is most likely a variation of the word "Marquis", which is spelled "mahr-kee" in IPA phonetic transcription. "Marquis" is a title given to a nobleman ranking above a count and below a duke. In modern usage, the term is often seen in the context of fashion or luxury, as with the brand name "Louis Vuitton Marquis".
The word Marquus is derived from the Latin word marchio, which means borderland or frontier. In medieval times, a marquus referred to a military commander or nobleman who was in charge of defending the borderlands of a kingdom or empire. This position was known as the march or marchland. Over time, the term marquus evolved to refer to a hereditary title of nobility, ranking below a duke but above a count or earl. The feminine form of marquus is marquessa or marquise.