Well I just discovered an interesting tidbit concerning Nicole Fantl(Fran). I saw a debate on the FFXII.net forums concerning her nationality. Like here, most were sure she was Icelandic, but couldn't find any solid evidence that stated it. It seems I got really lucky, because I stumbled upon a link to a website for a play in Los Angeles that the actress is currently in and it had cast info. Her accent is hard to figure out because it's a mix of many. She's listed all the way at the bottom of that page:
http://www.davidrouda.com/war_company.html

No wonder we all thought she sounded different from her sisters! XD