What is the meaning of Fier?

Archaic form of fire.

fern

proud

for

four

fair

Alternative form of figer

Alternative form of fyr

to trust (someone, something)

Alternative form of fer (cruel; fierce)

iron

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

proud, prideful, arrogant

remarkable

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

iron

tool made of iron

iron

far, distant

Source: wiktionary.org