Sofia is the Spanish, Italian, and Portuguese form of Sophia — both meaning "wisdom" from the Greek σοφία. The two spellings are essentially the same name, with Sofia being more common in Romance-language countries and Sophia in English-speaking ones.
Sofia has overtaken Sophia in popularity in many countries — Spain, Italy, Mexico, Argentina, Russia. In the United States, Sofia has been in the top 25 since 2008 and continues to climb. The simpler spelling appeals to families with Hispanic or Italian heritage.
Sofia reduces to four — the number of steady wisdom and quiet authority.