Amandil and Elendil had been the names of the 3rd and 4th Kings of Numenor respectively. While the later Numenoreans may have lost their reverence for the Eldar, they had not lost their reverence for their ancestors, and giving children the names of former kings was probably not an uncommon practice. As Galorme has already pointed out, Quenya was known by very few in Numenor at that time, so the actual meaning of the names may have not been widely known.
In any case it was no great secret that Amandil and Elendil were part of The Faithful. Rather, it was the fact that they were Lords of Anduine and Amandil's former friendship with Ar-Pharazon that protected them from persecution.
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"If you would be a real seeker after truth, you must at least once in your life doubt, as far as possible, all things." -- René Descartes
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