Nah, we can be certain that they were very distinct characters. Legolas of Gondolin, however, might be considered to have been abandoned as a name/idea by the time of LotR or later; we cannot really say since Tolkien never dealt with the Fall of Gondolin as thoroughfully as with the very early version which has Legolas in it. We do know that Elven names are not unique, however, so they may well have both existed.
As for the reusing of names such as Denethor or Boromir, I would like to point out that is not primarily because the author liked the names, but in order to represent the very credible circumstance that Men named themselves after heroes of old legends (including mortals, of course).
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