It depends on the functionality and use for each tool. If you carry multiple knives, there's going to be overlap where for certain tasks, any of them will do. But there may also be tasks where one of them is better suited to the tasks than the others.
I would say that "too many" means that you carry a knife that never gets used, or that the overlap in use is covered completely by one or more of your other tools and so that the only reason that you use it is for the sake of using it.
My normal daily carry is between 2 and 3 knives. Boker KeyCom clipped to a pocket with a small flashlight clipped to it. Double duty as a pocket dangler for the flashlight and quick one-hand operation for simple cutting tasks. Victorinox Cadet in right front pocket. The Cadet is a recent addition to my carry and I like it for the additional tools. Third (and somewhat redundant) is some type of traditional slipjoint. Case, Buck, or Great Eastern Cutlery, usually a 2 or 3 blade pattern.
The redundancy is between the Vic Cadet and the Case slipjoint. The Vic covers most of what I formerly used the Case knife for, though having the variety of blade shapes with the multi-bladed Case means it still gets some work, and the Vic blade rarely gets used.
If you count multitools, then I have yet another blade on a small Leatherman Squirt P4. I carry it for the other tools, it just happens to have a blade on it. I could probably make do for some things with the LM blade, it's just not optimal for most things I need. If the knife blade were snapped off on the LM, I'd still carry it for the other tools.
So - I carry multiple tools each day to cover different needs. They all have one or more blades on them, but also have features not covered as well by any of the others. I don't feel any particular need to minimize the number of blades I have on me. They're all small and relatively lightweight. I could probably get by with fewer, while reducing the overall utility, suitability to task, or convenience of my current tool set. But I don't see the motivation to reduce total blade count just to get to some arbitrary number of "not too many."
Bottom line is to carry how ever many you feel meets your needs or just your wants, and don't worry about whether the non knife carrying world thinks you are weird.