Found 2 boys and girls with the meaning of dukes
Conan / 5 letters 
Meaning of Conan In Celtic, Conan means High, wise. Introduced into Britain after the Norman Conquest. Famous bearers More
Cosimo / 6 letters 
Meaning of Cosimo In Greek, Cosimo means From 'kosmos' meaning order More

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rhymingridgeright
righteousrighteousnessrisen
riverriversroderick
roe-deerromanrome's
romulusroundroyal
ruinsrulerrules
rulingrunningrussian