What does this abbreviated name stand for?

[Margaret in Burton]

I have just seen Jo. on the IGI

It has a full stop after it so would it be John?

[Phoenix]

My guess would be John, but as it isn't a standard abbreviation it could be whatever the inventor meant at the time. Even Jane (via Johanna)

[Margaret in Burton]

My first thought was John.

Thanks

[Little Nell]

Might be Jos with the s bit lost, short for Joseph. John is unsually Jno.

[Grampa Jim]

Or Jonathon