One Nama of Narayan without any doubt would definitely please Lord Vishnu.
Eg:- Ajamila.
That doesn't mean that one can remain a loafer and say Narayana in dead bed no way.
In case of Ajamila he was a Brahmin and followed rituals and practices deligently
Like any other people he also slipped away from his Dharma and when he went to dead bed. He called the full name of his youngest son "Narayana" that call is enough for Vishnu Dhoothas to get initiated
More likely in today's world a Howzzat appeal is considered as a blanket appeal for everything. Similarly no matter how you called the name ensure you call the one name properly that will please Lord Vishnu that's enough.
Ajamila in modern day Cricket wow Flexed biceps.
Ohm Namo Narayanaya
