there were only about 10 Simons or Simeons bapt between 1800 and 1850 (with only 5 found in 1851 + 1861 censuses) compared to about 220 Samuels bapt and about 190 in each census tho many of these were not Manx born

I suspect that tho Samuels were probably often called Sam or Sammy I suspect Simons kept their rather shorter name