

The Finnish language does really not have the letter "g", even less in the beginning - except in loan words. So even then Gisela is pronounced more often 'Kisela' (never with a soft french dzheee in any case), so you'd probably name it 'ghoti' and call 'fish'.
You could always thou name it 'goira' or even better 'gissa', especially if its from Turku

Then again, Lapland...there might well be some Sami names starting with 'G'