That was not her maiden name but her name by a previous marriage, so probably the current legal name as of the birth?
So who exactly is Ted Cruzs mother, and how did she end up living in Canada? The Texas senators mother, Eleanor Darragh, was born to a Irish-Italian family in Delaware and was the first in her family to attend college, the National Journal reported in June. She worked as a computer programmer in New Orleans and Texas, and married Rafael Bienvenido Cruz, a mathematics graduate, in 1969, according to a big story published Wednesday in Macleans, one of Canadas top magazines. Cruzs parents moved to Canada to process seismic exploration data for oil companies in Calgary, and he was born there in 1970. http://www.ibtimes.com/why-did-ted-cruzs-mother-move-canada-texas-senator-says-eleanor-darragh-makes-him-2266436
"Rafael Bienvenido Cruz and Eleanor Darragh had lived in the Houston of Canada for three years by the time they had Rafael Edward Cruz, the only child they would have together (both had children from previous marriages"
http://www.macleans.ca/politics/washington/ted-cruz-made-in-canada/