[Blog Post] Page numbering was done by at least 4 scribes.

[Aga Tentakulus]

   
I was just there and read it. I think you have some thinking errors.
Here it has nothing to do with the ending "us". It's just numbers 29,39,49

With the written "nig + zig + cig"...
So they are numbers in words. Example: zwanzig, dreisig, vierzig ...  twenty, thirty, forty.
Here, as an example, "2zig"= zwanzig twenty.

"nig" is an Allemanic variant. "10nig" zänig  is a number.
In Switzerland it is sometimes still used, rarely, but it is there.