After Brecon Beacons National Park announced it volition beryllium changing its name, residents accidental they were not consulted.
The power - to Bannau Brycheiniog National Park - took effect connected Monday, its 66th anniversary.
Park bosses said the alteration promotes the area's civilization and heritage.
Some residents successful the Powys municipality of Brecon accidental radical volition proceed to usage Brecon Beacons, but a concern has already ordered labels with the caller sanction connected it.
The Welsh sanction means "the peaks of Brychan's kingdom" and is pronounced ban-aye bruch-ay-nee-og, with the ch making the aforesaid dependable arsenic successful loch.
Brycheiniog - named aft 5th Century King Brychan - was an autarkic kingdom successful the aboriginal mediate ages, and its borders astir lucifer those of the nationalist parkland today.
Brecon nonmigratory Derek Price, 82 said: "I indispensable say, I don't truly recognize it if you're looking astatine these places arsenic places that are welcoming to radical from each implicit the world.
"We person ever known the Welsh, but I americium definite erstwhile radical travel from different parts they volition not beryllium rather definite astir the connection and are inactive going to telephone it the Brecon Beacons.
"The different happening I americium perturbed astir is the outgo of it, erstwhile you see what they are going to person to bash to marque that change.
"It's not that I don't enactment the language, I do. But we bash person to beryllium cautious with respect to our viability."
His woman Ann Price, 80, said: "It's the meaning down it I don't understand. And they don't look to person taken the outgo into consideration. I deliberation determination should person been immoderate discussion, but I deliberation it would person happened anyway."
Bailea O'Connor, 22, from Sennybridge said: "In each honesty, I don't deliberation it should person happened.
"If you are not Welsh, you person a close to telephone it Brecon Beacons.
"I cognize a fewer locals who volition beryllium negatively affected by the sanction alteration due to the fact that immoderate radical can't pronounce it. Especially for a tourist, coming to the country asking for Brecon Beacons.
"I bash admit the affirmative interaction it has connected the Welsh connection - perchance teaching immoderate Welsh successful English schools oregon schools overseas [would help]."
Anthony Jones, of Left Bank Brewery successful Llangorse, Brecon, said: "We're not changing the names of the beers, due to the fact that we already incorporated the Welsh language, but our bottles accidental 'brewed successful the Brecon Beacons'.
"I already ordered immoderate labels past nighttime which accidental 'brewed successful Bannau Brycheiniog'.
"Everything blows over, but we volition usage it arsenic publicity, due to the fact that we are virtually the lone brewery successful the nationalist parkland and if radical are talking astir it successful immoderate sense, astatine slightest they're talking astir it."
The alteration volition besides impact visitors, said Lynn Chapman, who was visiting Brecon from Bodmin, Cornwall.
"It's alright for the Welsh people, due to the fact that they privation to promote the usage of the Welsh language. But if we were to travel present and everything's changed, we wouldn't cognize wherever to go.
"It's bully for the Welsh radical to support their language, but I deliberation it would beryllium bully to person the English underneath truthful radical visiting for the archetypal clip tin spot wherever it is.
"It's our 2nd clip we've travel here, and we volition inactive travel backmost but I deliberation I would person problems pronouncing it.
"It's connected the nationalist news, truthful everyone is going to cognize astir it, it's not going to beryllium a surprise, but it's astir getting utilized to that change."
Marie-Anne Griffiths of Beacons Crafts said she lone heard astir it the time the sanction changed.
"We person been present for 27 years and we are not going to alteration our name. I deliberation it's astir apt wealth poorly spent," she said.
"For 5 minutes it's brought the parkland to the news, but I deliberation the wealth could person been spent successful a amended way. I don't consciousness it was necessary.
"There indispensable person been a batch of radical who hadn't heard thing and it seems a shame due to the fact that it's the section radical it matters to a large woody and it would person been bully to beryllium consulted," Ms Griffiths said.