There really is no or else. Just choose a different name really.

Basically we have decided to deny any relations to all of the main characters and as such, we are denying some names as they can be easily assumed to be in some form related to the character themselves.

Restricted names
Harry
Draco
Hermione
Luna
Bellatrix
Lucius
Albus
Severus
Remus
Sirius
Narcissa
Aberforth
Scorpius
Regulus
James
Lily
Andromeda
Cornelius
Nymphadora
Fleur
Percival
Petunia
Neville
Rubeus
Cho
Mundungus
Black
Chang
Dumbledore
Evans
Fletcher
Fudge
Gaunt
Granger
Gryffindor
Hufflepuff
Lestrange
Longbottom
Lovegood
Lupin
Malfoy
Moody
Pettigrew
Perverell
Potter
Ravenclaw
Riddle
Slytherin
Tonks
Weasley