why is an orange called an “orange” but a lemon is not called a “yellow”?

V and U both used to represent the /U/ sound. The pointed form ⟨v⟩ was written at the beginning of a word, while a rounded form ⟨u⟩ was used in the middle or end. In old English W used to be written as two Vs.. so VV which later became one letter, and since V was still U the name. And yes.....