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Why do you say it isn't technically right? In English, the word - plural of pier - would be 'peerz'. No word ending in "rs" would be pronounced with a soft 'ss' sound.
Because it isn't an English name, it is French and it should be pronounced Pierce. It isn't the plural of pier.
But if it was French, the 's' wouldn't be pronounced at all. It would be 'pee-ehr'.