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This will not help determine how many is too many character to name but to mitigate the downsides, I would look closely at the types of names being used. For example five female characters named Li...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/42838 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
This will not help determine how many is too many character to name but to mitigate the downsides, I would look closely at the types of names being used. For example five female characters named Lindsey, Laurel, Lauren, Liza and Lizzie might be a tad hard to keep apart. Maybe some minor characters dont need full names, just titles or nicknames, which will flesh them out a little without mixing them up with someone more important.