What does everyone think of Fritha, an Anglicization of Fríða? I'm pronouncing it like "FREEDH-a" (the "dh" represents the "th" in Heather, leather, gather, etc.). I'm quite taken with it and probably prefer it to Frida (et al.).
Some combos:
Fritha Eleanor
Fritha Elowen
Fritha Rosemary
Fritha Caroline
Fritha Constance
Fritha Millicent
Fritha Melisande
Fritha Sibylle
Fritha Gwendolen
Fritha Leonora
Fritha Jocosa
Fritha Emeline/Emmeline
Fritha Rosalind
Fritha Rosamund/Rosamond
Fritha Celeste