It is not Seraph, that Wiki is wrong. We should know given we have spent 6 months researching and comparing, and I am in consultation with 10 japanese speakers. look carefully:

Seraph Comb > セラフコーム > Serafu Kōmu > Seraph Comb [anyone still complaining that Sepher Sephiroth is wrong, please note the differences]

セラフ Seraph
セーファ Sepher

]Safer・Sephiroth
セーファ・セフィロス
Seefa Sefirosu
Sepher Sephiroth
[This one always gets attention. Firstly, Sepher Sephiroth is inspired by the Seraph Seraph - Wikipedia, the free encyclopedia
But Sēfa does not make Seraph. This is a misconception. The word translates to either Sefer or Sepher (both are ok) and is Hebrew/Kabbalistic (as is Sephiroth)
Sephirot - Wikipedia, the free encyclopedia
Sefer Yetzirah - Wikipedia, the free encyclopedia
Sefer Torah - Wikipedia, the free encyclopedia
I am told by Gemini that Sepher is closer than Sefer and since Sephiroth is spelled by "Seph" it seems much more logical. Therefore, Sepher Sephiroth is the name. ]