Susannah, nn
Susie is so cute! As for your cousin, I suppose it would depend on how close you are and how often you or your children run into each other. I would err on the side of not using it, but I know how hard it is to give up a name you love. Perhaps if you each call the child by a different nn, then that would solve the problem. Finally, if you do use it, I would check with her first.
And what's with this French spelling of
Claire? If you love
Aoibheann so much, I declare you must spell it
Clare.
Susannah MaireadSusannah NiamhSusannah Maeve /
MeabhSusannah Aislinn /
AislingSusannah EibhlinSusannah EmerSusannah BrigidSusannah Liadin
Susannah Maureen /
MaireSusannah EveSusannah CarolineSusannah GeorginaSusannah Rosaleen