The couple filed an application with the US Patent and Trademark Office to protect their little one's name days after her birth in January, but the department have sent a suspended letter to the couple stating they have no legal right to keep the moniker just for themselves.

As a result of the ruling, a small wedding-planning company called Blue Ivy Events is allowed to continue to operate under the title, which it has been doing since 2009.

But brand owner Veronica Alexander - who filed her own application for fear of going out of business if she was no longer able to use the name - holds no grudges against the couple for attempting to trademark the moniker and admits their efforts have had a positive effect in promoting her organisation.

She told the Boston Herald newspaper: "I can't be frustrated with something I think is going to bring me to produce and define my brand even more, which is financially exciting in itself and intellectually exciting as well. It's like they caused me to create more opportunity for myself."

However, Alexander admitted she would "welcome" an offer from the couple to relinquish her rights to the 'Blue Ivy' name.

Knowles and Jay-Z – real name Shawn Carter – were said to be planning to launch a range of baby products and clothes under the name Blue Ivy.