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You can't name them according to their orbital position because we cant detect them all - either due to size, star brightness, orbital period and orbital inclination etc - that would mean their order would keep changing till there was nothing left to discover !!!
You can only give them a meaningful numerical indicator in terms of discovery date ranking because we are going to keep discovering these objects for the next million years.
It makes good sense to name them after their star - at least we will know where to look for them.
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