ترجمة - انجليزي-برتغالية برازيلية - lastnames

"Mizuta" is composed of "Mizu" = water and "ta" = field, meaning field of water. But usually put together, "Mizuta" means rice field.

"Shibata" is "shiba" = lawn grass and "ta" = field, so it means field of grass

By the notes,
"Mizuta" = "Arrozal"
"Shibata" = "Gramado"