As defined by the Cleasby & Vigfusson Old Norse to English dictionary:
- u, f., cp. grásíða, a cognom., Ísl. ii. 52.
Possible runic inscription in Younger Futhark:ᛒᛚᛅ-ᛋᛁᚦᛅ
Younger Futhark runes were used from 8th to 12th centuries in Scandinavia and their overseas settlements