What is "rugini"

The Rugini were a tribe in Pomerania. They were only mentioned once, in a list of yet to mission tribes drawn by monk Bede (also Beda venerabilis) in his Historia ecclesiastica of the early 8th century:

''Sunt autem Fresones, Rugini, Danai, Hunni, Antiqui Saxones, Boructuari; sunt alii perplures hisdem in partibus populi paganis adhuc ritibus servientis.

Whether the Rugini were remnants of the Rugii is speculative. The term Rugini was also interpreted as the first mention of the Slavic Rani (also Rujani), who in the Middle Ages dwelled on the isle of Rügen.