Stefanie is ainm dom.
Stefanie Alexandra's birth name is Stefanie Alexandra Robinson.
Stefanie Hertel's birth name is Stefanie Anke Hertel.
Stefanie Butler's birth name is Stefanie Lauren Butler.
Stefanie Paige's birth name is Stefanie Paige Fleishman.
Stefanie von Pfetten's birth name is Stefanie Christina Baroness von Pfetten.
Stefanie Powers's birth name is Stefania Zofia Federkiewicz.
Stefanie Schaeffer's birth name is Stefani Lynn Schaeffer.
Stefanie Eulinberg's birth name is Stephanie Lynn Eulinberg.
Stephanie Gatschet's birth name is Stephanie Lucile Gatschet.
Johnson is not an Irish name. This is not to say there are not Johnsons with Irish ancestry. So no Irish county is associated with the name Johnson.
Roibín
The form used in Irish is Heather as in English.