Miscellaneous: ROSCOMMON Surnames found County Roscommon  1100 thru 1600.
Ireland Genealogy Projects Archives
http://www.igp-web.com/IGPArchives/copyright.htm
http://www.igp-web.com/IGPArchives/roscommon/ 
Transcribed and contributed by Don Kelly 
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Dillon, Earl,             
Conroy,                 
French,                     
MacBrennan, Chief,          
MacDermott, Prince,               
MacDowell,             
MacKeogh, Chief,                                                                 
MacManus,                
MacOriaghty, Lord,       
O'Beirne, Chief,        
Norton or O'Naghten,    
O'Concannon,            
O'Connelan, Chief,     
O'Connor, King,         
O'Conor,  Don              
O'Corr,                  
O'Brien, King, Prince,    
O'Dugan,                        
O'Duigenan,                    
O'Donnelan,            
O'Fallon,               
O'Feenaghty,  Lord,     
O'Glennon,              
O'Fihelly               
O'Flannagan, Lord,       
O'Flynn, Lord,         
O'Hanley, Chief,        
O'Kelly, Prince,        
O'Meaney,               
O'Loman,                  
O'Monahan, Chief,           
O'Moran,                 
O'Malbride,            
O'Maol Conroy, Chief,  
O'Molloy,  
O'Mulrenin, Chief,     
O'Mulvihil,            
O'Norton, Chief,  
O'Shanahan,