The word "been" comes from Middle English been. It started in Old English bēon. Then it appeared in Middle English been. Later, people used it in Old English bēon. After that, it was Middle English been.
I's – A related word in the same word family.
is – A related word in the same word family.
am – A related word in the same word family.
Old English was a fully Germanic language before the Norman Conquest transformed it.