What is the meaning of Fier?

Archaic form of fire.

fern

proud, self-confident

gallant, high-hearted, of noble spirit

for

four

fair

alternative form of figer

alternative form of fyr

to trust (someone, something)

alternative form of fer (“cruel; fierce”)

proud, gratified, honoured [ with de ‘of someone, something’]

proud, prideful, arrogant

remarkable

to trust (someone), to rely (on someone) [with à]

apocopic form of fiero

iron

tool made of iron

iron

iron

far, distant

Source: wiktionary.org