The spelling of the word "townes" may seem odd with its additional "e", but it is a common variant in many surnames. The IPA phonetic transcription of this word is /taʊnz/, which reflects the American English pronunciation. The added "e" in "townes" does not affect the pronunciation, but rather serves as a way to indicate that the "s" is pronounced as /z/. This convention is also seen in other surnames such as "Jones" and "Hayes".
The word "townes" is likely a variation or alternative spelling of the word "towns". The etymology of the word "town" can be traced back to the Old English word "tun", which meant an enclosed space, farmstead, or village. It is related to the Old Norse word "tun" and the Old High German word "zun". Over time, the word evolved to refer to a populated area with its own local government and a higher degree of urbanization in comparison to a village or hamlet.