Abba - This Syriac or Chaldee word is found three times in the New Testament (Mark 14:36; Rom. 8:15; Gal. 4:6), and in each case is followed by its Greek equivalent, which is translated "father." It is a term expressing warm affection and filial confidence. It has no perfect equivalent in the English language. It has passed into European languages as an ecclesiastical term, "abbot."
From Easton's Bible Dictionary (1897)
Abba is also the name of a brand of fish products.
See also the article ABBA relating to the music group ABBA