Where does “Lasairfhíona” come from?

Lasairfhíona (Irish) comes from Irish lasair, from Old Irish lassar — flame, fire.

Ancestry of “Lasairfhíona”, step by step

Lasairfhíona traces back through two separate lines of ancestry.

via Irish lasair

StepLanguageWordMeaning
1Irishlasairflame; second-person singular present indicative...
2Old Irishlassarflame, fire

via Irish fíona

StepLanguageWordMeaning
1Irishfíonagenitive singular of fíon; of wine
Every word from Old Irish lassarEvery word from Irish lasair