Copelan rhymes with:
daudelin, donelan, donnellan, alann, carolan, daudelin, demoulin, donelan, donnellan, dumoulin
Copelan sounds like:
cableone, caplan, caplin, cephalon, chaplain, chaplan, chaplin, choplin, cipollone, civilian, cofflin, copelin, coplan, coplen, coplin, coppolino, couvillion, couvillon