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I wouldn't do this based on item name. Instead, I'd implement a system of modifiers to describe what an item does, something like...

{
    name: "itemA",
    displayName: "Slippers of Mighty Grace",
    effects: [
        {
            type: "statCheck",
            stat: "strength",
            threshold: 31,
            effectsIfMet: [
                {
                    type: "statBoost",
                    stat: "agility",
                    value: 20
                }
            ],
            effectsIfNotMet: [
                {
                    type: "statBoost",
                    stat: "agility",
                    value: 10
                }
            ]
        }
    ]
}

When you load this item from JSON, you string together a matching pattern of polymorphic effect nodes, each with their own Apply method.

When the item is equipped, or when the character's status changes in a way that might affect equipment properties, you re-run the Apply() methods of all equipped gear.