This is a clear case of a widespread root featuring a fascinating variety of phonetic changes. Words like ovo, ei, ou, kek, and jaje all mean "egg" and trace their origins back to the Proto-Indo-European *h₂ōwyóm. It helps to look at the outliers. In Celtic languages, forms like Irish ubh, Manx ooh, and Scottish Gaelic ugh, the evidence isn't entirely clear. Meanwhile, Baltic languages are also missing: Latvian settled on ola, and Lithuanian developed kiaušinis https://mapologies.com/animal-product