A female cow is called a "cow" - if it has not given birth it can be called a "heifer".
Perhaps you were thinking of a "cow" called 'Daisey'.
sisters
Harriet Tubbman
Lioness
Sister?
One Goddess with 7 letters in her name is Demeter, in Greek mythology. Also ARTEMIS.
Giraffe has seven letters
The actor and presenter you are referring to is "Matthew Fox." He has a first name with 7 letters and a surname with 3 letters.
Out of those letters, I'd try America.
panther
A Mustang (produced by Ford) has seven letters in its name.
i believe that the average letters for a first name is 5-9 letters
Mustang.