Building on what Saucepan said about Aragorn's need to be incognito, I think that he had so many names because he kept getting recognized as a noble lord, no matter what he did. The hobbits saw it in him, and certainly Denethor did. It seems that Aragorn's drawn to nobleness like a moth to flame...
So anyway, as soon as one name became recognized as a 'noble lord', he had to become someone else because he couldn't risk them dwelling on that line of thinking too long. This seems to be the especially the case with 'Thorongil' and 'Strider'.
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