As someone from Spain I'd like to say that this name has the connotations of being really old fashioned. Like a name someone's great grandma living in a remote village would have. If you take the connotations away it sounds nice, but again, everyone here would give weird looks about naming a baby this.
https://www.behindthename.com/name/saturnina/top/brazil
https://pt.m.wiktionary.org/wiki/Saturnina