Meaning of Arabella

[ronale7]

No: HPFGUIDX 44332

I'm ashamed of delurking about the subject of Arabella's name, but I 
have a resource apparently no one else has.  It's a 60-year old 
pamphlet (yes, I typed that right--it's copyright 1942) put out by 
the Ethyl Corporation and titled "What's in a Name?"

According to this pamphlet, the name Arabella has two derivations.  
First, there's the Latin one: fair altar; sweet refuge.  (Should we 
count that as one or two?  I'm treating it as one.)  And then it 
gives a source I haven't seen in the posts: the Teutonic one which 
means Eagle heroine.

This derivation leaves me confused.  Can anyone add to this Teutonic 
bit?  

--Ronale7