I was recently in a discussion with a friend regarding what she believed to be her family crest. She comes from, what I assume, is a decently well known family in France. (DaBlanc) This led to a greater discussion of the validity of crests as they are so often referenced when someone looks into their heritage and if hers was valid. Per example, and out of interest, I included what I believe she found regarding her crest in the comments. Can anyone verify that this was the crest of the DaBlanc family? It describes a "gold in the arm of flesh of a silver necktie and having three flowers of azure.."
This, from a reference book of French families.
http://www.geopatronyme.com/cgi-bin/carte/nomcarte.cgi?numero=0346892&periode=2
http://eraldica-occitana.over-blog.com/article-vaserac-gleisa-parroquiala-116843775.html
More of a question for /r/heraldry or something, but for starters you should perhaps read one of the ol' usenet Heraldry FAQs. The short of it is: If you don't know how (or even if) you're related to the person to whom the coat of arms was granted, you do not know it's your coat of arms. Your last name doesn't matter. Even being the same family doesn't necessarily matter, I mean if you're not a descendant of the one who had the coat of arms, it's not really your heritage, is it?
There are plenty of less-than-serious websites out there that'll sell you a picture of the 'coat of arms of the Smith name' even if it belongs to some specific Smith family that went extinct centuries ago. (and again, they don't belong to names) Generally if you just go googling for a 'crest' (actually only the top part of a coat of arms) associated with a family name, what you'll find is more likely than not to be unrelated to you. Most families, and branches of families, don't have coats of arms in the first place, and it's probably not very common that those who do have them, forget it.
It describes a "gold in the arm of flesh of a silver necktie and having three flowers of azure.."
Are you trying to machine translate Occitan heraldic terms? It's not a language I know either but from my knowledge of related languages I'd say "d'aur al braç dèstre de carnacion eissent d'una nivola d'argent e tenent tres flors d'azur, acompanhat de cinc tortèls d'azur tres en cap e dos en punta" should be read more (in non-heraldic English) as "On gold, a flesh-colored arm to the right, emerging from a silver cloud and holding three blue flowers, accompanied by five blue "tortèls", three at the head and two at the point".
That's not the same coat of arms as the one described for Monsieur Pierre Dablanc (1665-1698), so there's clearly more than one coat of arms used by people with that name.