Adelaide Amelia Louisa Theresa Caroline_of_Saxe-Coburg Meiningen 1792-1849 

History of the name

Adelaide Street, Adelaide Road, and Adelaide Cottages

Adelaide(left) 1792-1849 was the spouse of King William IV (1765-1837), and the sister-in-law of George IV.  Adelaide and William had two legitimate daughters (William had many illegitimate children).  One daughter died at birth, while the other died in infancy.  So the monarchy went to William's niece, Victoria, on his death.  George IV visited Dun Laoghaire in 1821, and many streets are named after members of his family.