Generate readable/memorable random names

FriendlyNames.cs

using System;
using System.Numerics;

class FriendlyNames
{
    static readonly string[] Adj =
    [
        "brave","silent","curious","mighty","witty","gloomy","rapid","fuzzy",
        "gentle","arcane","rusty","lunar","zen","feral","candid","sleek",
        "fiery","icy","stormy","cosmic","sinister","savage","naughty","vicious",
        "grim","cheeky","reckless","dirty","twisted","bloody","shadowy","morbid",
        "chaotic","lusty","toxic","doomed","iron","obsidian","thorny","volatile",
        "gritty","haunted","mad","drunken","demonic","warped","sinful","cruel",
        "pervy","smug","angry","wicked","warlike","cursed","nuclear","suave",
        "hungry", "thirsty", "loving", "stingy", "mad", "evil",
        "crimson","scarlet","violet","emerald","azure","golden","silver","copper",
        "black","white","gray","amber","jade","ruby","sapphire","onyx",
        "burgundy","coral","indigo","magenta","cyan","lime","orange","pink",
        "bronze","steel","titanium","platinum","diamond","crystal","marble","granite",
        "electric","neon","plasma","laser","quantum","atomic","digital","cyber",
        "frozen","molten","blazing","smoking","glowing","burning","flaming","scorching",
        "ancient","primal","eternal","infinite","ultimate","supreme","legendary","epic",
        "broken","shattered","cracked","bent","twisted","ruined","damaged","scarred",
        "wild","untamed","savage","brutal","ruthless","merciless","relentless","vicious",
        "secret","hidden","shadow","ghost","phantom","spectral","invisible","cloaked",
        "thunder","lightning","storm","hurricane","tornado","blizzard","avalanche","earthquake"
    ];

    static readonly string[] Noun =
    [
        "lion","otter","falcon","dragon","monkey","wolf","panda","tiger",
        "phoenix","badger","eagle","yak","orca","mamba","serval","vulture",
        "shark","rat","crow","hyena","boar","scorpion","spider","serpent",
        "donkey", "whale","cobra","viper","panther","leopard","cheetah","jaguar",
        "bear","rhino","hippo","gorilla","chimp","octopus","squid","mantis",
        "demon","angel","warlock","witch","wizard","goblin","troll","orc",
        "nymph","giant","djinn","sphinx","vampire","zombie","ghoul","lich",
        "wraith","specter","banshee","necromancer","paladin","assassin","rogue","thief",
        "tank","missile","grenade","bomb","rifle","dagger","blade","sword",
        "mace","arrow","cannon","warrior","berserker","raider","sniper","pirate",
        "axe","spear","katana","scythe","hammer","crossbow","pistol","shotgun",
        "devil","temptress","minx","seducer","playboy","bastard","rogue","villain",
        "joker","clown","drunkard","pervert","hustler","fiend","pimp","outlaw",
        "daddy","kitten","bunny","stud","vixen","freak","beast","savage",
        "knight","samurai","ninja","ronin","gladiator","champion","crusader","hunter",
        "reaper","slayer","executioner","butcher","mercenary","bounty","assassin","killer",
        "fortress","castle","tower","citadel","bastion","stronghold","keep","bunker",
        "storm","thunder","lightning","blizzard","tornado","hurricane","avalanche","inferno",
        "machine","engine","reactor","generator","turbine","motor","dynamo","forge"
    ];

    readonly long _n;
    readonly long _b;
    readonly long _m;
    long _index;

    public FriendlyNames() : this(Random.Shared.Next()) { }

    public FriendlyNames(int seed)
    {
        _n = (long)Adj.Length * Noun.Length;
        if (_n == 0)
            throw new InvalidOperationException("Empty word list.");

        _b = seed % _n;
        _m = MakeCoprimeMultiplier(seed, _n);
        _index = 0;
    }

    public string Generate(char separator = '-')
    {
        var k = _index++;
        var p = ((k * _m) + _b) % _n;
        var a = (int)(p / Noun.Length);
        var s = (int)(p % Noun.Length);
        return $"{Adj[a]}{separator}{Noun[s]}";
    }

    static long MakeCoprimeMultiplier(int seed, long n)
    {
        var m = ((long)seed * 2 + 1) % n;
        if (m == 0) m = 1;

        while (BigInteger.GreatestCommonDivisor(m, n) != 1)
            m = (m + 2) % n;

        return m;
    }
}