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There is a belief that the name Somport is derived from Summus Pyreneus but it's not certain.
No, Somport is from Summus Portus -- Portus is Latin meaning "mountain pass". It really just means "the High Pass", perhaps in relationship to the easier, lower Valcarlos one.
The same word Portus is found in the Perthus (that's literally Portus on its own, and by FAR the easiest Roman road crossing into Iberia was there), Puigcerdà, Saint Jean Pied de Port (Saint John at the foot of the Pass), and a couple dozen or so other places on or near the top of the Pyrenees.