Adopting an Irish accent requires a “tongue” of work so to speak.

Source: https://www.forbes.com/sites/brucelee/2023/02/19/american-in-his-50s-develops-new-uncontrollable-irish-accent-from-cancer/

Her grandmother spoke Yiddish with a heavy Irish accent and Powley said that her partner’s Dutch grandmother hid Jews under their floorboards during the Holocaust.

Source: https://www.algemeiner.com/2023/04/27/we-have-to-remember-cast-and-crew-of-new-miniseries-a-small-light-talk-about-holocaust-era-heroism/

The sketch featured two of SNL’s cast members doing impressions of the two actors being asked questions on the red carpet, to which they gave incomprehensible responses intended to mimic an Irish accent.

Source: https://www.thejournal.ie/snl-irish-oscars-sketch-6017366-Mar2023/

Though everyone here is chewing the scenery, he's far and away the best part of the movie, throwing himself into an Irish accent dialed up to eleven and a car trunk full of shoes.

Source: https://collider.com/disney-channel-original-movie-luck-of-the-irish/