Perhaps Alfred Simonson was the son of William Ashby and Mary Simonson?See 1820 census of Washington Twp., Knox County, Indiana:
Mary Simonson3000000011 William Asby000001
Simonson and Asby are enumerated right next to each other.Also in that twp. are many Hollingsworths, a family known in Union County SC, and Mumford Bicknell, whose wife I seem to recall was a Nancy Ashby.I once saw a reference to a Hollingsworth, I believe, of Knox IN, who sold land in Union County SC that had been granted to James Ashby in 1796.
The name Ashby sometimes appears as Asby, more frequently it is mis-read as Ashly or Ashley.
You will find a William Ashby in the 1800 Union County SC census, also a John Ashby, who may be his brother.See my postings on Ashby forum.According to John Ashby's descendants, the Union SC Ashbys came from Virginia.
I note you have a Nancy Scane mentioned in conjunction with Magnus Simonson's will.Nicholas Skain in Union SC was md. to Rachel Ashby.Postings about this also on Ashby forum.