Reynold m. Proto-Germanic *ragin 'counsel, might' + Proto-germanic *wald 'power, authority'.
The name of a 10th C Norse overlord in Britain, two 11th and 12th C kings in the Scottish isles, 12th C Swedish king, a 12th C Norwegian saint, and a 13th C king of Man.
The English form Raynald is witnessed in 1379 in the relational byname Raynaldsoñ (WRYPT1 p. 18).