Declercq's rhymes with:
declerck's, declerk's, declerque's, deklerk's, declerck's, declerk's, declerque's, deklerk's, clerk's, clerks, clerks', declerck's, declerk's, declerque's, deklerk's, klerk's
Declercq's sounds like:
declares, declerck, declerck's, declercq, declerk, declerk's, declerque, declerque's, deklerk, deklerk's, desillers, deslauriers, discolors