Eckardt rhymes with:
beckert, dechert, deckert, eckert, heckart, heckert, ackert, bankert, beckert, benkert, bickert, borchert, brockert, burkert, dankert, dechert, deckert, deichert, dickert, eckert, feickert, folkert, guckert, hackert, heckart, heckert, herkert, lockert, mackert, markert, pickert, reichert, richert, rickert, ruckert, rueckert, schweickert, schweikert, stepanakert, stockert, stuckert, teichert, ueckert, volkert, weichert, weikert, wickert, wiechert
Eckardt sounds like:
echard, eckard, eckart, eckerd, eckert, eckhard, eckhardt, eckhart, eckrote, eckroth, egert, eggert, egret, eisert, ekkehard, escort, escorted, escrowed, esworthy, euchred, exaggerate, exaggerated, excoriate, excoriated, excrete, exert, exerted, exhort, exhorted