Possibly from a North Germanic name starting with Bor, Bur (e.g. Old Swedish Bore) or as a byname/nickname from dialectal pura, purikka (“bull calf”) (probably from pura).
Pura
| Inflection of Pura (Kotus type 10/koira, no gradation) | ||||
|---|---|---|---|---|
| nominative | Pura | Purat | ||
| genitive | Puran | Purien | ||
| partitive | Puraa | Puria | ||
| illative | Puraan | Puriin | ||
| singular | plural | |||
| nominative | Pura | Purat | ||
| accusative | nom. | Pura | Purat | |
| gen. | Puran | |||
| genitive | Puran | Purien Purainrare | ||
| partitive | Puraa | Puria | ||
| inessive | Purassa | Purissa | ||
| elative | Purasta | Purista | ||
| illative | Puraan | Puriin | ||
| adessive | Puralla | Purilla | ||
| ablative | Puralta | Purilta | ||
| allative | Puralle | Purille | ||
| essive | Purana | Purina | ||
| translative | Puraksi | Puriksi | ||
| abessive | Puratta | Puritta | ||
| instructive | — | Purin | ||
| comitative | See the possessive forms below. | |||