Le dernier mois means 'the last month (of a series)' in French.
Décembre est le dernier mois de l'année > December is the year's last month.
Au départ tout allait bien, mais le dernier mois a été difficile > at the beginning all was fine, but the last month was more difficult.
BUT if you want to speak of something that took place last month, the resembling expression 'le mois dernier' is better: she had a baby last month > elle a eu un bébé le mois dernier. She visited her grandparents last month > elle a rendu visite à ses grand-parents le mois dernier.
the last month
"Fernier" is not a word. Do you mean "dernier"? The word "dernier" means "last". For example "le mois dernier" = "last month"
le mois dernier
Le mois dernier
le mois means 'the month' in French.
quel est le mois = what is the month tv = television aller au parc = to go to the park
last weekend
le dernier
Le Dernier cri was created in 2006.
Le Dernier Homme was created in 1805.
Le dernier sorcier was created in 1867.
C'est Noel, c'est le mois de Decembre.