i don't know what 'Jno" or "Jns" is short for as a name.
There could be a couple of interpretations for each - for example:
Jno could be Jonathan or John
Jns could be Junius or Jonas
As far as what the actual meaning were from the time they were recorded that way - I don't know.2
Just remember, though, that we don't expand abbreviated person names in indexing, so we'd leave it as Jno.1
It would help if you would post the project and batch number you are working on so volunteers could see the context it is used in.
For example: US, New York—Statewide Index to Land Records, Grantors, 1630–1975 [Part A] [L3LL-33L]0
Jno is the old abbreviation for John. Jns could be John, James or Jonas. We'd have to see the batch to make sure and as @barbaragailsmith1 said, we do not expand abbreviations, unless it's explicitly stated in the Field Help.0
@erutherford Jns being John - ah yes, especially if a Romance language where it could abbreviate Johan/Johannes
General comment: (as some have laid bait) I will forgo the entire argument about wildcards not being an expansion of an abbreviation ...
but as mentioned on other threads, if I do not know the name for which an abbreviation is representational or if placement of a wildcard could harm interpretation of a name - I would not add a wildcard. If it adds no harm or I am highly certain of the name then I might add one.0