Whenever someone tells me they played Portmarnock Links, they invariably follow it up with a comment of the form "no it wasn't the championship/famous/big course". They could have named it St. Marnock's Golf Club, as the 6th century church is on the site. They probably wouldn't be able to avoid comparisons totally, especially when you have such an established course next door, but it could have lessened the now obligatory clarification every time. The follow-up comment in this case could have been a bit less negative, i.e. "the course next to Portmarnock Golf Club".
Or better still, call it Jameson's, as I believe the distiller John Jameson had some connection to the site, and may have lived in the old house, which is now part of the hotel.
I'm also not a fan of naming courses by colour, for example when you have 27/36/54/.., etc holes on the same property. I just can never remember the colour. I think Portmarnock's third nine is yellow, but I'm not sure.