The problem is in tracing these various groups because they were decentralized in their church government and the names they were known by were picked by the dominant state religion of the time. However, be that as it may, they existed.
Another problem is the Catholics burnt some of them and all of their writings with them. Much of history is lost.
"The problem is in tracing these various groups because they were decentralized in their church government"
Baptists don't keep lists and if we did, we wouldn't share them 'cause other Baptists would steal (borrow) them.