Irish spelling isn't that bad at all, in fairness. There's a rule "leathan le leathan agus caol le caol" that should help though. It means when you have verbs with a, e or u, they're broad (leathan) and the endings will usually match up. Likewise, the narrow (caol) vowels i and e will normally match up.
could be i am just hearing things or possibly i know hindi where there is a word सावन if i wrote it in english it would roughly be sawan it means monsoon i think that caused me to hear things this is a link to what it sounds like... i could not find a better way to post it https://translate.google.com/#auto/en/%E0%A4%B8%E0%A4%BE%E0%A4%B5%E0%A4%A8