* JAR-ish (with emphasis on the first syllable and a short "i" sound)
* JAY-rish (with emphasis on the first syllable and a long "a" sound)
* JA-rish (with emphasis on the first syllable and a short "a" sound)
* JAR-iss (with emphasis on the first syllable and a short "i" sound, similar to the word "bliss")
Ultimately, the best pronunciation depends on the context and the person's preference. If you're unsure, it's always best to ask the person how they pronounce their name.