I noticed that cultural names do not show up on empty holdings which is probably an oversight from CK2 where empty holdings wouldn't display the name at all until build. Also once it is build new holdings do not get new name right away and requires a reload.
Empty holding with no localization
Irish name in files
Cultural name shows up after building the holding and reloading the save file.

Empty holding with no localization

Irish name in files

Cultural name shows up after building the holding and reloading the save file.
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