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| Fallbeyging | |
| Nefnifall | Ernst |
| Þolfall | Ernst |
| Þágufall | Ernst |
| Eignarfall | Ernsts |
| Notkun núlifandi¹ | |
| Fyrsta eiginnafn | 16 |
| Seinni eiginnöfn | 18 |
| ¹Heimild: þjóðskrá júlí 2007 | |
| Listi yfir íslensk mannanöfn | |
Ernst er íslenskt karlmannsnafn.