How common was it for JFK to be referred to as "Jack Kennedy?"

[Colibri]

@Keeve

@Exapno_Mapcase

I did a newspaper database search for Jack Kennedy fro 1959 to 1963. It returned 89,340 hits.

That number doesn’t mean much without some context. I concede that 89,340 proves that it did happen, but it does not prove it to be “an absolutely common everyday matter”.

I think it does, actually.

Could you please search that same database for “John Kennedy” and “John F Kennedy” and tell us how many hits you get?

Those will very likely be more common. However, the most common name, especially in newspaper headlines, most likely would have been JFK.