You are going to want to steer away from the oversized pendants with those dimensions, but the rest is personal preference. I have an area almost that size with track lighting on the ceiling which you may want to consider if you cannot find pendants that won't block your view.

we don’t know your style but maybe consider 2 of the mini pendants from rejuvination. My son-in-law had 3 of their mini pendants in his last kitchen and I loved them. I’ll try to find a pic.

https://www.rejuvenation.com/catalog/products/rose-city-2-1-4in/configurations/pn-opal-dome

Their island was about 4x7. These tiny pendants didn’t put out much light but they added a bit of style.

It is more about angle and not the size. You could actually choose any size you want, just have to pick right lighting angle for the right installation height. For example if the light angle of the fixture is 90° degrees, you could illuminate a table which is twice as big as the distance from the table top to the fixture.