| Part of speech | common noun |
|---|---|
| Hyphenation | fil·o |
| Singular | Plural | |
|---|---|---|
| Nominative | filo | filoj |
| Accusative | filon | filojn |
| Afrikaans | seun |
|---|---|
| Albanian | bir |
| Catalan | fill |
| Czech | syn |
| Danish | søn |
| Dutch | zoon |
| English | son |
| English (Old English) | sunu |
| Faeroese | sonur |
| Finnish | poika |
| French | fils |
| German | Sohn |
| Hawaiian | keikikāne |
| Hungarian | fiú |
| Icelandic | sonur |
| Italian | figlio; figliolo |
| Jamaican Patois | son |
| Latin | filius; natus |
| Low German | söäne; söön |
| Luxemburgish | Bouf; Fils; Jong |
| Norwegian | sønn |
| Papiamento | yiu; yiu hòmber |
| Polish | syn |
| Portuguese | filho |
| Romanian | fiu |
| Russian | сын |
| Saterland Frisian | Suun |
| Scots | son |
| Scottish Gaelic | mac |
| Spanish | hijo |
| Sranan | manpikin |
| Swahili | mwana |
| Swedish | son |
| Thai | บุตร; ลูกชาย |
| Turkish | oğul |
| Ukrainian | син |
| Welsh | mab |
| West Frisian | soan |
| Yiddish | זון |