Some sources,clues & work of others, some undocumented:
Mayberry HELM, 1701-ca.1790, b England, buried Westminster Churchyard, Baltimore MD; lived Frederick CoVA, went to Baltimore as a young man; will 1789 Baltimore County MD; had 11 granddaughters, 10 grandsons in 1789, believed to have had two sons, one dau and two stepsons; m Mrs. Ann Parish Puntany who died 1776; prob m twice.
John MADDEN was an associate of Leonard, Thomas and Leonard Jr. HELM in various business and court actions; came to America ca 1719; d ca? 1758; m Brigit/Bridget HELM and had dau and son Mabra/Mayberry;
See: Background to Glory by J. Bakeless, Lippencott, 1957; History of Kentucky; Kentucky Pioneers and Their Descendants, Kentucky Historical Society; Who Was Who in Hardin Co KY by Hardin Co Hist Society; will of Leonard Helm, Frederick Co VA Will Book 1, p 67-68; Shenandoah Valley Pioneers...etc. by Cartmell ca 1900; History of the Parochial Chapelry of Goosnargh by Fishwick.