The EJs have 魔法使い for "mage".

〈魔／ま／マ〉〈法／ほう／ホウ／ホー〉〈使（い）／遣（い）／つかい／ツカイ〉

Google N-gram Corpus Counts
╭─ーーーーーー─┬───────────┬───────╮
│ 魔法使い　　 │ 1,187,575 │ 91.9% │
│ 魔法遣い　　 │    26,116 │  2.0% │ - rK
│ 魔法使　　　 │    29,610 │  2.3% │ - [io] to [sK]
│ 魔法つかい　 │     8,627 │  0.7% │ - sK
│ まほう使い　 │     2,604 │  0.2% │ - add, sK
│ まほう使　　 │       248 │  0.0% │
│ マホー使い　 │        86 │  0.0% │
│ ま法使い　　 │        55 │  0.0% │
│ 魔法遣　　　 │        36 │  0.0% │
│ マホウ使い　 │        24 │  0.0% │
│ まほうつかい │    36,840 │  2.9% │
│ マホウツカイ │       570 │  0.0% │
│ マホーつかい │        33 │  0.0% │
╰─ーーーーーー─┴───────────┴───────╯

@@ -10,0 +11,5 @@
+<ke_inf>&rK;</ke_inf>
+</k_ele>
+<k_ele>
+<keb>魔法使</keb>
+<ke_inf>&sK;</ke_inf>
@@ -13,0 +19 @@
+<ke_inf>&sK;</ke_inf>
@@ -16,2 +22,2 @@
-<keb>魔法使</keb>
-<ke_inf>&io;</ke_inf>
+<keb>まほう使い</keb>
+<ke_inf>&sK;</ke_inf>

https://dic.pixiv.net/a/メイジ
メイジ
めいじ
メイジ（古英語:mage）とは魔法使いを意味する言葉である。

https://eow.alc.co.jp/search?q=魔法使い
charmer
conjure person（米国南部や西インド諸島の）
conjurer
enchanter〔可算〕
mage〈古〉
magic user
magician〔可算〕
magus〔【複】magi〕
sorcerer
spell-caster
warlock
witch

https://finalfantasy.fandom.com/wiki/Mage_(job)

My current anime translates as "mage", and that seems like a useful fit to me. eijiro marks as "dated"〈古〉, but that seems a bit silly as "mage" is quite common in the English genres where this term might be used. (role playing games, historical fantasy, etc.)

The fact that it's used in a recently produced/translated anime kind of makes that point for me (Frieren). I believe "mage" was a character class way back in Final Fantasy I for the NES in the late 80s.

I'd also note in favor of this term, none of the other terms here would work particularly well as a substitute in this scenario. magician has modern slight-of-hand connotations. Wizards are men, witches are women, and sorcerer's are a bit too over-the-top powerful in a society with a lot of general "everyday" magic.

@@ -29,0 +30 @@
+<gloss>mage</gloss>

Actually, I don't think this belongs in this entry. The 魔法使い in the meme/legend still refers to a wizard.

@@ -31,7 +30,0 @@
-<sense>
-<pos>&n;</pos>
-<misc>&net-sl;</misc>
-<s_inf>from an Internet meme/legend</s_inf>
-<gloss>30-year-old virgin wizard</gloss>
-<gloss>person who has become a wizard by staying a virgin until they are 30 years old</gloss>
-</sense>

https://knowyourmeme.com/memes/30-year-old-virgin-wizard
has spread outside of Japan and is I think "relatively well-known" under this name in certain circles.

@@ -33,2 +33,4 @@
-<misc>&sl;</misc>
-<gloss>man who remains a virgin by age 30</gloss>
+<misc>&net-sl;</misc>
+<s_inf>from an Internet meme/legend</s_inf>
+<gloss>30-year-old virgin wizard</gloss>
+<gloss>person who has become a wizard by staying a virgin until they are 30 years old</gloss>