River thames is named after whom?

The River Thames (/ˈtɛmz / (About this soundlisten) TEMZ), known alternatively in parts as the Isis, is a river that flows through southern England including London. At 215 miles (346 km), it is the longest river entirely in England and the second-longest in the United Kingdom, after the River Severn

The River Thames may take its name from the Sanskrit Tamas meaning 'dark' as its waters are often dark and cloudy; another school of thought is that it is named after the Roman Tam meaning 'wide' and Isis meaning water."