And as the lame man who was healed held Peter and John, all the people ran together unto them in the porch that is called Solomon's, greatly wondering.
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Alcuin of York
AD 804
It is called Solomon's portico, because Solomon went to pray there. The porches of a temple are usually named after the temple
Now when they were at the portico of Solomon in which Jesus, that true Solomon, used to walk and where sometimes he disputed with the Pharaisees. The novelty of the event had struck the minds of all.
We have to know that the temple included not just its main building, but the surrounding porticos as well; it was on these porticos that the people stood and prayed, for only the priests prayed in the temple.