Givanildo (b): It’s a name of (I assume given the bearers) Brazilian Portuguese origin, but I can’t find any meaning.
Examples:
Givanildo Oliveira (b.1948) - The Oldest Notable Bearer of this name, and a Brazilian footballer
Givanildo [name_f]Vieira[/name_f] de Souza (b.1986) - More famously known as Hulk, another Brazilian footballer