What does "International Journal of" mean or imply?
It means nothing, as mentioned in the comments. A new journal must take a different name from existing ones, but usually wants to convey by its title what its subject is, e.g. Finance. If "Journal of Finance" is taken, one option is to name the new journal "International Journal of Finance". There are other options: "Journal of Financial Studies", "Review of Finance", "Finance Bulletin", "Finance Advances" or simply "Finance".

There is the marketing aspect that the journal name should sound fancy and intellectual, so "Blah Finance" is not a common title choice.