What name was only mentioned once in the bible?

Answer 1

There is no particular - or "special" answer to this.

In The Bible, names are given to people, places, tribes and to some things.

Just looking at names which begin with the letter E, and which only appear once, we get a long list.

People

1. the word - Edar - appears once
2. the word - Ehi - appears once
3. the word - Eker - appears once
4. the word - Eladah - appears once
5. the word - Elead - appears once
6. the word - Eliadah - appears once
7. the word - Elidad - appears once
8. the word - Elienai - appears once
9. the word - Elihoenai - appears once
10. the word - Elihoreph - appears once
11. the word - Elika - appears once
12. the word - Eliphal - appears once
13. the word - Eliseus - appears once
14. the word - Elishaphat - appears once
15. the word - Elisheba - appears once
16. the word - Elmodam - appears once
17. the word - Elnaam - appears once
18. the word - Elpalet - appears once
19. the word - Eluzai - appears once
20. the word - Elymas - appears once
21. the word - Emmanuel - appears once
22. the word - Emmor - appears once
23. the word - Enosh - appears once
24. the word - Epaenetus - appears once
25. the word - Ephai - appears once
26. the word - Eran - appears once
27. the word - Eshek - appears once
28. the word - Eshtemoh - appears once
29. the word - Esli - appears once
30. the word - Ethbaal - appears once
31. the word - Ethnan - appears once
32. the word - Ethni - appears once
33. the word - Eubulus - appears once
34. the word - Eunice - appears once
35. the word - Euodias - appears once
36. the word - Eutychus - appears once
37. the word - Ezar - appears once
38. the word - Ezbai - appears once
39. the word - Ezri - appears once

Places

1. the word - Eglaim - appears once
2. the word - Elbethel - appears once
3. the word - Eleph - appears once
4. the word - Elonbethhanan - appears once
5. the word - Elparan - appears once
6. the word - Eltekon - appears once
7. the word - Emmaus - appears once
8. the word - Enam - appears once
9. the word - Eneglaim - appears once
10. the word - Enhaddah - appears once
11. the word - Enhakkore - appears once
12. the word - Enhazor - appears once
13. the word - Enmishpat - appears once
14. the word - Enrimmon - appears once
15. the word - Entappuah - appears once
16. the word - Ephesdammim - appears once
17. the word - Erech - appears once
18. the word - Ezem - appears once

Tribe

1. the word - Elkoshite - appears once
2. the word - Emins - appears once
3. the word - Eranites - appears once
4. the word - Erites - appears once
5. the word - Eshkalonites - appears once
6. the word - Eshtaulites - appears once
7. the word - Eznite - appears once
8. the word - Ezrahite - appears once

Things

1. the word - Ed - appears once (an altar)
2. the word - EleloheIsrael - appears once (a month)
3. the word - Elul - appears once (a month)
4. the word - Esek - appears once (a well)
5. the word - Eshtemoh - appears once
6. the word - Ethanim - appears once (a month)
7. the word - Euroclydon - appears once (a wind)
8. the word - Ezel - appears once (a stone)

Answer 2

Lucifer

Answer 3

Rufus