I've modified the previous answer here because it disregarded Spanish spelling, but was otherwise correct for the pronunciation "blahn-KEE-tah":
"Blanquita", with "qu" instead of "c", means "little white girl" in Spanish. The root word is "blanco"/"blanca" which means white. and the -ita is used to show affection or it could also mean little. Most people think this is derogatory or mean, but in reality, it's not. it just depends on what way it's used.
If you were asking about a word or name pronounced "blahn-KEE-tah", this is a good answer. I've never heard of "Blancita", which in Spanish would be pronounced "blahn-SEE-tah", and would be meaningless AFAIK.