The English language is a Germanic language but it has influences from a variety of other languages. One of them is the Celtic language where it gets a wordage that is unique to Celtic and English.  These are the only two known languages in the world to use the “meaningless ‘do’ “. In the statements “How DO you feel?” and “Why DO you walk?” the word ‘do’ has no meaning and it just takes up space in a sentence.

(The Great Courses – Myths, Lies, and Half-Truths of Language Usage)