Declension of byrþ (i-stem)
 | 
 singular | 
 plural | 
 | 
 indefinite | 
 definite | 
 indefinite | 
 definite | 
|  nominative | 
 byrþ
 | 
 byrþin
 | 
 byrþi(r), -e(r)
 | 
 byrþina(r), -ena(r)
 | 
|  accusative | 
 byrþ
 | 
 byrþina, -ena
 | 
 byrþi(r), -e(r)
 | 
 byrþina(r), -ena(r)
 | 
|  dative | 
 byrþ
 | 
 byrþinni, -inne
 | 
 byrþum, -om
 | 
 byrþumin, -omen
 | 
|  genitive | 
 byrþa(r)
 | 
 byrþinna(r)
 | 
 byrþa
 | 
 byrþanna
 |