I don't think blanche is short for anything. It means White in french though.
Blanche
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Blanche is not a word in Swahili. If the name is from a root meaning "white," the equivalent word in Swahili would be mweupe, as applied to a person. However, it would not be used as a name.
Blanche, played by Dody Goodman.
Le Château de la Reine Blanche in Coye-la-Forêt
Blanche Earle's birth name is Taylor, Blanche.
Blanche Yurka's birth name is Jurka, Blanche.
Blanche Baker's birth name is Garfein, Blanche.
Blanche Cardin's birth name is Blanche Cardinale.
Blanche Rubin's birth name is Blanche Rita Mallins.
Blanche Poupon's birth name is Blanche Marguerite Allard.
Blanche Sweet's birth name is Sweet, Sarah Blanche.
Blanche Stewart's birth name is Blanche Patricia Omelian.
Blanche Mehaffey's birth name is Blanche Berndt Mehaffey.
Blanche Lincoln's birth name is Blanche M. Lambert.
Blanche Forsythe's birth name is Blanche Victorine Forsythe.
August Blanche's birth name is August Theodor Blanche.