Restructured the project structure back to the way it was, there's no reasonable way to split the modules

src/NadekoBot/_common/CommandNameLoadHelper.cs

@@ -0,0 +1,31 @@
+using YamlDotNet.Serialization;
+
+namespace NadekoBot.Common.Attributes;
+
+public static class CommandNameLoadHelper
+{
+    private static readonly IDeserializer _deserializer = new Deserializer();
+
+    private static readonly Lazy<Dictionary<string, string[]>> _lazyCommandAliases
+        = new(() => LoadAliases());
+
+    public static Dictionary<string, string[]> LoadAliases(string aliasesFilePath = "data/aliases.yml")
+    {
+        var text = File.ReadAllText(aliasesFilePath);
+        return _deserializer.Deserialize<Dictionary<string, string[]>>(text);
+    }
+
+    public static string[] GetAliasesFor(string methodName)
+        => _lazyCommandAliases.Value.TryGetValue(methodName.ToLowerInvariant(), out var aliases) && aliases.Length > 1
+            ? aliases.Skip(1).ToArray()
+            : Array.Empty<string>();
+
+    public static string GetCommandNameFor(string methodName)
+    {
+        methodName = methodName.ToLowerInvariant();
+        var toReturn = _lazyCommandAliases.Value.TryGetValue(methodName, out var aliases) && aliases.Length > 0
+            ? aliases[0]
+            : methodName;
+        return toReturn;
+    }
+}