Actually I found a note, 2 times in my bible, that calls Sunday - 'Upon the first day of the week which the Scripture calleth the Lords day, others Sonday', spelled both times with the first three letters 'Son'.
May not be much, but there it is, the translators put it in the gloss of the bible in 1560.
I have seen older writings that spelled it Sunday as well. I suspect, (my thoughts), the writers of the Geneva may have referred to believers, who, meeting on 'Sunday" preferred to refer to it as Sonday, thinking toward Christ, which would make perfect sense, as well as 'taking back', if you will, the Lord's day from the false sun god.
- Genevanpreacher likes this