italics: borderline/don't like the pronunciation

bold: probably can't use it

• Antonio
• Armand(o)
• August/Augosto/Augustin
• Bartholomew/Bartolome
• Emmanuel
• Felix
• Frederick/Frederico
• Gideon
• Hugo
• Ignatius/Ignacio
• Indigo
• Jethro
• Lorcan
• Luca
• Lucian
• Oliver
• Oscar
• Phineas
• Rafael
• Roscoe
• Santiago
• Sebastian
• Simon
• Theodore/Teodoro
• Tobias