I checked the Nihonto Club database for all Showa-era "Kane" smiths and came up with the below list. Some were listed 2-3 times due to different signatures (only name; residence + name; residence + family name + art name; etc.). Anyway, I'll wager a doughnut to a dollar the list is not exhaustive.
In addition to "shape," I zeroed-in on kanji that had the mu ム and/or kuchi ロ elements, and placed them at the top of the list:
Shōwa (1926-1989)
兼治 Kaneharu [Mori Kaneharu]
兼岩 Kaneiwa
兼若 Kanewaka
兼吉 Kaneyoshi
兼信 Kanenobu [hmmmmmm ... nah, I don't think so.]
兼俊 Kanetoshi
兼高 Kanetaka
兼門 Kanekado
兼國 Kanekuni
兼正 Kanemasa
兼道 Kanemichi
兼時 Kanemichi
兼元 Kanemoto
兼宗 Kanemune
兼長 Kanenaga
兼成 Kanenari
兼延 Kanenobu
兼則 Kanenori
兼眞 Kanezane
兼重 Kaneshige
兼住 Kanesumi
兼友 Kanetomo
兼繼 Kanetsugu
兼氏 Kaneuji
兼幸 Kaneyuki
--Guy
In addition to "shape," I zeroed-in on kanji that had the mu ム and/or kuchi ロ elements, and placed them at the top of the list:
Shōwa (1926-1989)
兼治 Kaneharu [Mori Kaneharu]
兼岩 Kaneiwa
兼若 Kanewaka
兼吉 Kaneyoshi
兼信 Kanenobu [hmmmmmm ... nah, I don't think so.]
兼俊 Kanetoshi
兼高 Kanetaka
兼門 Kanekado
兼國 Kanekuni
兼正 Kanemasa
兼道 Kanemichi
兼時 Kanemichi
兼元 Kanemoto
兼宗 Kanemune
兼長 Kanenaga
兼成 Kanenari
兼延 Kanenobu
兼則 Kanenori
兼眞 Kanezane
兼重 Kaneshige
兼住 Kanesumi
兼友 Kanetomo
兼繼 Kanetsugu
兼氏 Kaneuji
兼幸 Kaneyuki
--Guy
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