The name Ebba is a girl's name of German, English origin meaning "fortress of riches, or strength of a boar". Ebba and is often added to lists like Unique Girl Names: Unusual and Rare and discussed in our forums with posts like "Quick Question Thread?!".
From the experts:
Ebba, the feminine version of Eberhard and also a form of an old English name, is in the Swedish Top 10 but virtually unknown in the US. However, with the rise of Emma, Ella, Ada, and similar simple-yet-traditional names, Ebba may enjoy more widespread popularity.