bherəg- / Indo-European roots
To shine; bright, white.Oldest form *bherhxgibreve;-, becoming *bherhxg- in centum languages.
1. bright from Old English beorht, bright, from Germanic *berhtaz, bright.
2. "The white tree" the birch (also the ash).
a. birch, birk from Old English birc(e), birch, from Germanic *birkjōn-;
b. probably suffixed zero-grade form *bhrag-s-. fraxinella from Latin fraxinus, ash tree.
[Pokorny bherəg̑- 139.]