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Re: Origin of name & variants
This is way over-simplified. Marissa seems to have been independently created in the USA in the 19th century by blending Mary and Melissa. Maritsa and Maritza are respellings in Spanish speaking countries of the Slavic and Hungarian name Marica. In those languages the letter "c" is pronounced like "ts" is in English. Maritza would be more often found in Latin America than in Spain because in most dialects of Latin American Spanish, "Z" is pronounced like "S".
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A lot of people confuse usage with origin. I am not sure which intention the OP had by her proposed corrections.
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