🇵🇹 Portugal · Boy names
Portuguese Boy Names Starting with O
🇵🇹 Portugal has 54 registered Portuguese boy names starting with the letter O, including Obiajulu, Oceano, Octavian, Octávio, Odin. Each name on this list complies with Portugal's naming law as administered by the IRN, meaning parents can register their baby with any of these names without legal pushback. Use this page to browse, then click any name to see its full legal profile, regional variants, and registration tips. For an overview of all naming rules in Portugal, visit our Portugal country guide.
54
Names starting with O
3322
Total boy names
IRN
Naming authority
More letters
All 54 Portuguese boy names starting with O
Switch gender
Portuguese Girl names starting with O →
Wider scope
All European boy names starting with O →
Same letter in another country
FAQ
How many Portuguese boy names start with O?
There are 54 Portuguese boy names beginning with the letter O in our EuroNameCheck database, out of 3322 total Portuguese boy names registered with the IRN.
Are these names legally registrable in Portugal?
Yes. Every name on this page is drawn from publicly accepted Portuguese naming practice and the IRN register. Spelling, accents and length all comply with Portugal's naming law. Always confirm with your local registry office before registration.
What is the most popular Portuguese boy name starting with O?
Obiajulu is a leading Portuguese boy name starting with O in our database of 54 options. For real-time popularity rankings, see our Portugal top names page.
Check a name in Portugal
Run any of these names through our free legality checker — covers all 25 European countries.
Check a Name →Last updated: 2026-05-13. For informational purposes only. Always consult your local IRN for definitive answers.