What is Ebba?

Legal Definition
Ebba is a feminine given name, the feminine version of Ebbe, which is a diminutive form of the Germanic name Eberhard or Everhard, meaning "strong." Alternately, it may be a form of an Old English name Æbbe, of unknown derivation, which was the name of several early saints. The name was the 10th most popular name given to girls born in Sweden in 2009.
-- Wikipedia
Legal Definition
In old English law. Ebb. Ebb a et fluctus; ebb and flow of tide; ebb and flood. Bract fols. 255, 338. The time occupied by one ebb and flood was anciently granted to persons essoined as being beyond sea, in addition to the period of forty days. See Fleta, llb. 6, c. 8, § 2.
-- Black's Law Dictionary
Legal Definition
Ebb.
-- Ballentine's Law Dictionary