family tree info Harn/Hearne/Heron

Hello to All,

I am trying to research my geneolgy, and from what I have seemed to discover is that my maternal lines originate from the Heron family. My maternal grandfather was Ralph Harn, son of Albert Maywood Harn. I have follwed the lines back to John Harn (1740-1793) but that's where I become confused. The name of his father was apparently John Caleb HEARNE, and it appears to go back to HERNE, Nicholas (b.1595) and eventually John "Of Chipchase" Heron, husband to Margaret Musgrave. Can anyone attempt to help me?
Thank you all so very much!

Scott