Why do airlines have geographical names in them? Why do airlines name themselves for example "Cathay Pacific" or "Virgin Atlantic". Aren't they indirectly limiting themselves to always fly over "Pacific" or "Atlantic"? It would be weird if Virgin Atlantic flies over Pacific and vice versa.
In a lot of cases it's because they started serving a specific region.

Lucky tells the story of Cathay Pacific. Virgin Atlantic was started specifically to fly from Britain across the Atlantic. Lots of US airlines started in a specific region, like Southwest. Westjet started serving the west of Canada.

It doesn't make sense to change a well-known name just because the reach of the airline is extended.