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wizardofoz
a search pulls up 潺茄, 羊角豆, 秋葵, 毛茄. which is most commonly used in hk provision shops and supermarkets?
[www.cantonese.sheik.co.uk]
Honestly, I didn't know what okra was in Chinese, I guess part of the issue is that it's not a very commonly used vegetable in HK. However, after a brief google search of those terms restricted to HK websites, 潺茄 significantly outnumbers the others, so I'd go with that.