Blanca

Also Romansh:
Source: "Vornamen in der Schweiz. Prénoms en Suisse. I nomi in Svizzera. Prenoms in Svizra" (1993) published by the Association of Swiss registrars
https://www.portraitarchiv.ch/portrait?page=144

Also used in Galicia: http://www.ige.eu/igebdt/esq.jsp?idioma=gl&ruta=onomast/nomes.jsp

Also Provençal and Gascon: https://ieo-oc.org/spip.php?page=article&id_article=300 --- Source: Institut d'Estudis Occitans

My name is Blanca and I’m American born (1985). My grandmother was also Blanca and she was from Puerto Rico. I’ve only met one other in my entire life.

Also Occitan: https://fr.wiktionary.org/wiki/Blanca --- Source: Michel Grosclaude, Dictionnaire étymologique des noms de famille gascons, 2003

My fiance is Romanian and her name is Blanca.
According to what I've found, "Bianca" is the normal Romanian spelling for this name. But her family is from Transylvania where the Hungarians ruled for a couple hundred years. Maybe the Hungarian spelling "Blanka" influenced her parents to give her the "Blanca" spelling.

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The /k/ sound is soft in her name - nearly two sounds: /Blangka/, almost. I believe it to be a wonderfully beautiful name. I am so grateful that she isn't American with the dreadful "Blanche". I cringe at the sound of that word...

More than 99.9 percent of people with the first name Blanca are female.
Also Dutch.

Also used in Catalan: http://www.idescat.cat/noms/?q=BLANCA [noted -ed]

The name Blanca was given to 116 girls born in the US in 2015.

The name Blanca was given to 150 baby girls born in the US in 2012.