I don't think blanche is short for anything. It means White in french though.
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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.
Dame Blanche - 2002 is rated/received certificates of: Belgium:KT
Blanche Earle's birth name is Taylor, Blanche.
Blanche Cardin's birth name is Blanche Cardinale.
Blanche Yurka's birth name is Jurka, Blanche.
Blanche Baker's birth name is Garfein, Blanche.
Blanche Lincoln's birth name is Blanche M. Lambert.
Blanche Rubin's birth name is Blanche Rita Mallins.
August Blanche's birth name is August Theodor Blanche.
Louis Blanche's birth name is Louis Jean Blanche.
Blanche Stewart's birth name is Blanche Patricia Omelian.
Blanche Sweet's birth name is Sweet, Sarah Blanche.
Blanche Poupon's birth name is Blanche Marguerite Allard.
Blanche Mehaffey's birth name is Blanche Berndt Mehaffey.