What I call irregular F plurals are nouns that end in the /f/ sound and are irregular plurals. Words like leaf, wife, and wolf. Not all nouns that end in /f/ are irregular plurals, however. Words like gulf, turf, and clef are regular plurals. Regular plurals in English simply add an S to the noun. Boy become boys, girl becomes girls, and lesson becomes lessons. Irregular plurals don’t do this. Some words that end in the /f/ sound, form the plural using ves. Of the irregular F plurals, leaf becomes leaves, knife becomes knives, and wolf becomes wolves. Notice that knife ends in FE but has the /f/ sound.
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