Ó Dubhshláine is the Irish spelling.
there is an Irish surname - Delaney, which is pronounced the same - so it could be related
English, from the Norman surname De l'aunaie meaning "from the alder grove" in French.
Using census records, it is estimated that about 1,600 Americans have the first name Delaney while about 36,500 Americans have the last name Delaney.
The Buttigieg surname comes from Malta.
The surname Cardenas comes from Spain.
The surname Chavarria comes from Spain.
The Khroud surname comes from India.
The surname Udy comes from Cornwall.
The surname Pedigo comes from Malaga, Spain
The surname Deatherage comes from Kent, England.
The Torres surname comes from Spain and Portugal.