There are 165 -os names for baby boys. Displayed on this page are -os names 1 to 20. The unusual -os names are Agapios (Greek), Aggelos (Greek), Aiolos (Greek), Alekos (Greek), Alesandros (Spanish), Alexandros (Greek), Alvertos (Greek), Ambros (German), Amos (English, German, and Hebrew), Anakletos (Greek), Anastasios (Greek), Anastassios (Greek), Andonios (Greek), Angelos (Greek), Aniketos (Greek), Anthanasios (Greek), Antonios (Greek), Antos (Polish), Apollos (English), and Apostolos (Greek). -os names are somewhat popular baby names for boys. The names have been increasing in popularity since the 1940s. At the modest height of their usage in 2001, 0.411% of baby boys were given -os names. There were 3 -os names ranked within the top 1000 baby names then. In 2008, 3 -os names listed among the top 1000, with a combined usage of 0.355%. Within all -os names, the Portuguese and Spanish Carlos was the most commonly used, with a ranking of #73 and a usage of 0.2789%.
| Agapios | love ... largely used in the Greek language and ... name was borne by a Caesarean saint martyred ... |
| Aggelos | messenger of God, angel ... origin is Old Greek, and its use, Greek ... variant form of Angel ... |
| Aiolos | changeable, nimble ... of Old Greek origin and it is used ... variation of Eolo ... not in the top 1000 names ... |
| Alekos | defender of men ... used mostly in the Greek language and ... variant form of Alexander ... |
| Alesandros | defender of men ... used predominantly in Spanish and ... form of Alexander ... |
| Alexandros | defender of men ... language of origin is Old Greek and it is ... variant form of Alexander ... |
| Alvertos | nobly famous ... of Germanic origin and it is used ... variation of Albert ... not in the top 1000 names ... |
| Ambros | immortal, divine ... used mostly in the German language and ... form of Ambrose ... |
Amos  | borne by God; bearer ... origin is Hebrew, and its use, English, German, ... uncommon as a baby boy name ... |
| Anakletos | called forth ... used predominantly in Greek and it ... uncommon as a baby boy name ... |
| Anastasios | resurrection ... of Old Greek origin and it is used ... form of Anastasius ... rare as a baby boy name ... |
| Anastassios | resurrection ... has its origins in the Old Greek ... variant form of Anastasius ... |
| Andonios | priceless, inestimable ... largely used in Greek and it is ... form of Anthony ... |
| Angelos | messenger of God, angel ... language of origin is Old Greek and it is ... variation of Angel ... |
| Aniketos | unconquerable, unconquered ... largely used in the Greek language ... variant form of Anicetus ... |
| Anthanasios | stone, bear; thor, the eagle ... language of origin is Celtic and it is used ... form of Arthur ... |
| Antonios | priceless, inestimable ... of Latin origin and it is used mainly ... variation of Anthony ... |
| Antos | priceless, inestimable ... language of origin is Latin and it is used ... variant form of Anthony ... |
| Apollos | to destroy ... language of origin is Old Greek and it is used ... variation of Apollo ... |
| Apostolos | apostle ... origin and use are both in the Greek language ... not often used as a baby boy name ... |
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