Ein-

Meaning of Old Norse word "ein-"

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

ein-

in compds denoting only, or only one in an intensive sense, vide the following words.

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