Sharmar, there would appear to be a connection, though l have not done any research prior to the marriage of William and Ann then the birth of Jonas. Jonas moved to Scotland, shows up on the 1891 census for Holytown Lanarkshire as a coal miner (no sign of family), 1901 census he is still a miner, 40 years old with wife Sarah Ann (Shepherd), children Sarah Ann 16, Rose Ann 15, Blanche 11 - all born in England then Jonas 9, Mary 5 and Richard William 2 (my husband's grandfather),all born in Lanarkshire. My records indicate they married in 1888 in Dawley and Sarah's previous married name was Reynolds so l doubt the older children were Underwoods. My husband's uncle was known as Jack and never knew until he died that he was also a Jonas!
SarahU
p.s. note of interest, this male line of Underwoods has now died out. Uncle Jack had no children, my husband and l had no sons, my husband's brother had one son but parents divorced and boy legally took the step-father's name. However, my one daughter kept the Underwood name professionally.