Öhrli is actually the swiss german diminutive of Ohr (ear). Swiss german uses -li a lot for diminutives, whereas standard german uses -chen or -lein, the vowel

Öhrli is actually the swiss german diminutive of Ohr (ear). Swiss german uses -li a lot for diminutives, whereas standard german uses -chen or -lein, the vowel of them stem is turned into an umlaut Ohr -> Öhrli/Öhrchen/Öhrlein.