Fé means wealth or cattle, as cattle were the equivalent of wealth. Meaning the more livestock you owned, the wealthier you were.

Stanza from the Icelandic Rune Poem

Wealth is the cause of conflict among kinsmen
and fire of the sea
and path of the serpent.

Stanza from the Norwegian Rune Poem

Wealth causes conflict among kinsmen;
a wolf is born in the woods.