The Revd Frank Sherman Delo 1865 to abt.1945grandson of George Michael Delo wrote an unpublished 30 odd page booklet on A History of American Delos.My uncertainty is that I have recently moved home and the book is temporary misplaced.
From my database the parents of George Michael Delo were Michael Harman Delo born c.1743 Hanover T wp Washington PA and died c.1782 allegedly at the hands of Indians his mother being Marie Keiffer.
The parents of Michael Harman Delo were Peter Delo born 1697 in the Palatinate or France and Anna Dorothea Thilo
My list of children of George Michael Delo copies yours quite closely.
In the next few days I will try and find this book of Revd Frank Sherman Delo (whose father incidentally was David Delo born 18th October 1817).