Where does “Šiaurės Airija” come from?

Šiaurės Airija (Lithuanian) comes from Lithuanian Airija, from Lithuanian -ija, from Latin -ia, from Latin -ius, from Proto-Italic -jōs, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “Šiaurės Airija”, step by step

Šiaurės Airija traces back through two separate lines of ancestry.

via Lithuanian Airija

StepLanguageWordMeaning
1LithuanianAirijaIreland
2Lithuanian-ijaAdded to form names of places or administrative...
3Latin-iaUsed to form a feminine abstract noun, usually...
4Latin-iusforming adjectives from nouns; nominative neuter...
5Proto-Italic-jōsForms comparative adjectives
6Proto-Indo-European-yósCreates adjectives from noun or verb stems

via Lithuanian šiáurė

StepLanguageWordMeaning
1Lithuanianšiáurėnorth compass point
Every word from Proto-Indo-European -yósEvery word from Latin -iaEvery word from Latin -ius