Gjálfra

As defined by the Cleasby & Vigfusson Old Norse to English dictionary:

gjálfra

að, to roar, of the sea: to chatter.

Possible runic inscription in Younger Futhark:ᚴᛁᛅᛚᚠᚱᛅ
Younger Futhark runes were used from 8th to 12th centuries in Scandinavia and their overseas settlements