This word is from the Spanish llanera.

Oval-shaped tin molds are widely referred to in the Philippines as “leche flan molders” because the molds are most often used in making leche flan.

Liyanera is also used in making the Quezon specialty called hardinera.

Liyanera for Hardinera
Hardinera in Liyanera (Oval-Shaped Tin Molds)

Misspellings: linyera, lanyera

Ito ay hulmahang lata para sa paggawa ng letse plan o hardinera.

In the United States, you can buy these on Amazon, or more cheaply at the FilAmStore. Understand though that these Philippine-made bakeware are crude and basic, so manage your expectations. 🙂