public static string HandleGreekMaleMajorNouns(string name)
{
	// Make some first checks
	if (string.IsNullOrEmpty(name) || name.Length < 3)
		return name;

	Regex re_has_greek = new Regex(@"[α-ωΑ-Ω]");
	if (!re_has_greek.IsMatch(name))
		return name;

	// Check last character. If it is ς, σ or Σ then assume it is Greek male major noun
	int name_length = name.Length;

	// Check if name ends with vowel and [σςΣ]
	// In case we have non Greek names like Οβρένοβιτς no modification must be done
	// Also works for female nouns
	Regex re = new Regex(@"[αεηιουωΑΕΗΙΟΥΩάέήίόύώΆΈΉΊΌΎΏ][σςΣ]$");
	if (!re.IsMatch(name))
		return name;

	// Get the pre-final letter
	string previous_character = name.Substring(name_length - 2, 1);
	// In case pre-final is ο replace with ε or Ε
	string replace_letter = previous_character;
	if (previous_character == "ο")
		replace_letter = "ε";
	else if (previous_character == "Ο")
		replace_letter = "Ε";

	// name contains σ, so must be handled, according to rules
	// Check if name has tonos ' anywhere. If not, then handle it in a more simple way
	Regex re_tonos = new Regex(@"[άέήίόύώΆΈΉΊΌΎΏ]");
	if (!re_tonos.IsMatch(name))
		return name.Substring(0, name_length - 2) + replace_letter;

	// MORE COMPLICATED! MUST FIND TONOS POSITION
	// Check if name ends with ος or ός
	Regex re_ostonos = new Regex(@"[όΌ][σςΣ]$");
	Regex re_os_gen = new Regex(@"[οΟ][σςΣ]$");
	var os_tonos_mtch = re_ostonos.Match(name);
	if (os_tonos_mtch.Success)
	{
		return name.Substring(0, name_length - 2) + (previous_character == "ό" ? "έ" : "Έ");
	}

	var os_gen_mtch = re_os_gen.Match(name);
	if (os_gen_mtch.Success)
	{
		// Check if tonos is in paraligousa and ends with ος
		Regex re_paraligousa1 = new Regex(@"[άέήίόύώΆΈΉΊΌΎΏ][^άέήίόύώΆΈΉΊΌΎΏαεηιουωΑΕΗΙΟΥΩ]{1,3}[οΟ][σςΣ]$");
		Regex re_paraligousa2 = new Regex(@"[άέήίόύώΆΈΉΊΌΎΏ][οΟ][σςΣ]$");
		var paraligousa_mtch = re_paraligousa1.Match(name);
		var paraligousa_mtch2 = re_paraligousa2.Match(name);
		if (paraligousa_mtch.Success || paraligousa_mtch2.Success)
			return name.Substring(0, name_length - 1);
		else
			return name.Substring(0, name_length - 2) + replace_letter;
	}

	return name.Substring(0, name_length - 1);
}