I have now come across the last name ApSimon. A quick Google search reveals that there are quite a few people named like that, some spelling their last name ApSimon and some Apsimon. I am wondering why there is double capitalization in some cases – is this in any way related to the “Mc” names? Is it another prefix with a similar or different meaning? In any case, the “Ap” prefix seems to be a lot less common than “Mc”.
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'Ap' means 'son of'. The Welsh used to use a patronymic system, but surnames eventually fixed after Welsh union with England. Iceland continue to use a patronymic system.
Apsimon/ApSimon/ap Simon are possible variants; my paternal Great grandfather was Simon Jones of Bala (d.1873); his son Thomas Jones, b. 1843, my paternal grandfather, made an entry in the family bible in 1855, signing as Thomas Apsimon; this form is used in obituary notices for his father. This is the earliest occurrence as a formal surname that I have come across, though use as a descriptive term 'X, son of Simon' occurs earlier in documents. The use of the capital S is an attempt to make the name readable to English speakers.