Why is the geographic name displayed next to unknown numbers in call log?

When I get a call from an unknown number my phone displays the area associated with the area code. For example 01 would show Dublin. When I look at the call log the area name is shown there also.

Phone: Moto G, Android: 4.4.4, Carrier: 3 Ireland
I have installed a few apps but none explicitly associated with this functionality.

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