Certain dyes are named incorrectly, such as brown dye, white dye, black dye and blue dye.

These dyes have the same name as the material used to create them -

Brown dye's name is cocoa beans, white dye is bonemeal, black is ink sac, and blue is lapis.

If you want to find these dyes in the crafting table, you need to search for the material used to make them because the normal dye won't show up.

All the other dyes are named correctly.