SYNTYCHE (f) "common fate" (Greek). This is the name of a woman mentioned in
Paul's epistle to the Philippians in the New Testament.
I don't know the answer to your question about Corwyn
Brandt, but I find it intriguing that you picked the names of two of the princes in one of my favorite series,
Roger Zelazny's "Chronicles of
Amber" (spelled Corwin and
Brand).