International Journal of Linguistics ISSN 1948-5425 2013, Vol. 5, No. 3 www.macrothink.org/ijl 1 A Semantico-Phonological Investigation of Proper Nouns Marwan A. Jarrah Dept. of Linguistics, the University of Jordan Amman 11942, Jordan Tel: 962-776842490 E-mail: masaljarrah@yahoo.com Eid Alhaisoni University of Hail, Kingdom of Saudi Arabia E-mail: eid.alhaisoni@gmail.com Yazeed M. Hammouri Dept. of European Languages, the University of Jordan Amman 11942, Jordan Tel: 962-777483619 E-mail: hammouryy@yahoo.com Muhammad S. Shehadeh University of Hail, Kingdom of Saudi Arabia E-mail: msa141285@yahoo.com Received: January 27, 2013 Accepted: February 18, 2013 Published: June 24, 2013 doi:10.5296/ijl.v5i3.3152 URL: http://dx.doi.org/10.5296/ijl.v5i3.3152 Abstract This paper investigates the underlying aspects which would account for why some Arabic geographical names accept the addition of the definite "?al" to their beginnings and why some don’t accept such an addition. The study depends on the data taken from “"Atlas of Jordan and World, 2003"”. This research is only oriented to the monosyllabic and disyllabic