| Part of speech | common noun |
|---|---|
| Hyphenation | frat·o |
| Singular | Plural | |
|---|---|---|
| Nominative | frato | fratoj |
| Accusative | fraton | fratojn |
| Afrikaans | broer |
|---|---|
| Albanian | vëlla |
| Catalan | germà |
| Chinook Jargon | aw |
| Czech | bratr |
| Danish | broder; bror |
| Dutch | broeder; broer |
| English | brother |
| English (Old English) | broþor |
| Faeroese | bróðir |
| Finnish | veli |
| French | frère |
| German | Bruder |
| Greek | αδελφός |
| Greek (Old Greek) | ἀδελφός |
| Hawaiian | kaikuaʻana; kaikaina; kaikunāne |
| Hungarian | fivér |
| Icelandic | bróðir |
| Italian | fratello |
| Jamaican Patois | breda |
| Latin | frater |
| Low German | broor |
| Luxemburgish | Brudder |
| Malay | kakak |
| Norwegian | bror |
| Papiamento | frè; ruman; ruman hòmber |
| Polish | brat |
| Portuguese | irmão |
| Romanian | frate |
| Russian | брат |
| Saterland Frisian | Bruur |
| Scots | brither |
| Scottish Gaelic | bràthair |
| Spanish | hermano |
| Sranan | ba; brada |
| Swahili | kaka; ndugu |
| Swedish | broder; bror |
| Thai | น้องชาย; พี่ชาย; พี่ |
| Turkish | birader |
| Ukrainian | брат |
| Welsh | brawd |
| West Frisian | broer |
| Yiddish | ברודער |