No, Maureen O'Hara was born as Maureen FitzSimons, she had 5 siblings Peggy, Florrie, Charles, Margot, and Jamesand Maureen was born in 1920.
Catherine O'Hara was born on March 4, 1954.
Catherine O'Hara's birth name is Catherine Anne O'Hara.
Catherine O'Hara's full name is Catherine Anne O'Hara.
Indeed she did. She was raised in Dublin along with her brother and sister, named James and Mary.