Suoma was more commonly used in the early 20th century leading up to World War II. Suoma also means "granted" in Finnish (specifically "granted by...", from Finnish "suoda" (to grant/give) and I believe it is mostly used in that sense.
It's said that the first person to use this name was Antero Warelius, a Finnish priest and writer, who named his daughter Suoma in 1849 because he thought the child was a gift given by God. In Finnish "suoda" means "to give".
Suoma also means "granted" in Finnish (specifically "granted by...", from Finnish "suoda" (to grant/give) and I believe it is mostly used in that sense.