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I found that the Spanish page
http://www.partosindolor.com/nombresnenas.htm
and other pages list Deolinda as a shorter form of Teodolinda, and that in turn is explained on this Italian page
http://digilander.libero.it/gioer/lf.html
as deriving from the two Germanic words that make up Dietlinde.

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I think together with the overall similarity of Deolinda and Dietlinde this makes the derivation quite probable.