Ok from my

C:\program files\Total War\Medieval - Total War\Loc\Eng\names.txt

// Hero forenames
[El] {El}
[Mathilda] {Mathilda}
[Llewellyn] {Llewellyn}
[Fra] {Fra}
[Simon] {Simon}
[Stephan] {Stephan}
[Black] {Black}
[Wat] {Wat}
[Owain] {Owain}
[Iskander] {Iskander}
[Ibn] {Ibn}
[Theodosios] {Theodosios}
[Gregory] {Gregory}
[Saxo] {Saxo}
[Bo] {Bo}
[Al-Afdal] {Al-Afdal}
[Najamuddin] {Najamuddin}
[Nur] {Nur}
[Asad] {Asad}
[Sharaf] {Sharaf}
[Fakhr] {Fakhr}
[Ibn Taymiya] {Ibn Taymiya}
[Odon] {Odon}
[Strongbow] {Strongbow}
[Bertrand] {Bertrand}
[Francesco] {Francesco}
[Blondel] {Blondel}
[Godfrey] {Godfrey}
[Gerard] {Gerard}
[ChrQtien] {Chrétien}
[Jacques] {Jacques}
[Hartmann] {Hartmann}
[Albertus] {Albertus}
[Albert] {Albert}
[Hannekin] {Hannekin}
[Werner] {Werner}
[Bohemond] {Bohemond}
[Boniface] {Boniface}
[Alighieri] {Alighieri}
[Catruccio] {Catruccio}
[Ambrogio] {Ambrogio}
[Alberigo] {Alberigo}
[Bartolomeo] {Bartolomeo}
[Bartolomei] {Bartolomei}
[Domingo] {Domingo}
[TomNs] {Tomás}
[Frenando] {Frenando}
[Hasan-e] {Hasan-e}
[Imad] {Imad}
[Qara] {Qara}
[Qutb] {Qutb}
[Vlad] {Vlad}
[Domash] {Domash}
[Giles] {Giles}
[Cola] {Cola}
[Gil] {Gil}

// Hero surnames

[Cid] {Cid}
[Diaz de Vivar] {Diaz de Vivar}
[de Boulogne] {de Boulogne}
[Sgouros] {Sgouros}
[of Locksley] {of Locksley}
[Dolcino] {Dolcino}
[de Montfort the Younger] {de Montfort the Younger}
[Walays] {Walays}
[Urosh Dushan] {Urosh Dushan}
[Agnes Dunbar] {Agnes Dunbar}
[van Artevelde] {van Artevelde}
[Tyler] {Tyler}
[Glyndwr] {Glyndwr}
[Bey] {Bey}
[Khaldun abd al-Rahman] {Khaldun abd al-Rahman}
[Boradiotes] {Boradiotes}
[Acropolites] {Acropolites}
[Beccus] {Beccus}
[Palamas] {Palamas}
[Sphrantzes] {Sphrantzes}
[Grammaticus] {Grammaticus}
[Sturluson] {Sturluson}
[Elovsdottir] {Elovsdottir}
[Jonsson Grip] {Jonsson Grip}
[Shahinshah] {Shahinshah}
[Ilghazi of Aleppo] {Ilghazi of Aleppo}
[al-Din] {al-Din}
[al-Din Shirkoh] {al-Din Shirkoh}
[ad Din] {ad Din}
[ad-Din] {ad-Din}
[al-Harrani] {al-Harrani}
[de Bayeux] {de Bayeux}
[de Normandie] {de Normandie}
[Borleng] {Borleng}
[FitzGilbert] {FitzGilbert}
[Beckett] {Beckett}
[Mercadier] {Mercadier}
[Marshall] {Marshall}
[de Nesle] {de Nesle}
[de Montfort the Elder] {de Montfort the Elder}
[Calveley] {Calveley}
[Hawkwood] {Hawkwood}
[de Grailly] {de Grailly}
[Knollys] {Knollys}
[Chaucer] {Chaucer}
[Camoys] {Camoys}
[de la Pole] {de la Pole}
[of Cluny] {of Cluny}
[of Boulogne] {of Boulogne}
[of Bouillon] {of Bouillon}
[of Clairvaux] {of Clairvaux}
[de Payns] {de Payns}
[of Ypres] {of Ypres}
[de Ridefort] {de Ridefort}
[de Troyes] {de Troyes}
[Cadoc] {Cadoc}
[de Charny] {de Charny}
[Froissart] {Froissart}
[le Maingre Boucicault] {le Maingre Boucicault}
[de la Salle] {de la Salle}
[de Richmont] {de Richmont}
[Bureau] {Bureau}
[de Bueil] {de Bueil}
[of Arc] {of Arc}
[the Lion] {the Lion}
[von Aue] {von Aue}
[of Marburg] {of Marburg}
[of Bohemia] {of Bohemia}
[Sterz] {Sterz}
[Bongarten] {Bongarten}
[von Lrslingen] {von Ürslingen}
[Zizka] {Zizka}
[de Tankerville] {de Tankerville}
[of Montferrat] {of Montferrat}
[de Plano Carpini] {de Plano Carpini}
[d'Assisi] {d'Assisi}
[Dante] {Dante}
[Castracane] {Castracane}
[Visconti] {Visconti}
[da Barbiano] {da Barbiano}
[Colleoni] {Colleoni}
[Sforza] {Sforza}
[Petrach] {Petrach}
[Oleshnicki] {Oleshnicki}
[Petrovich] {Petrovich}
[Kirillovich] {Kirillovich}
[de GuzmNn] {de Guzmán}
[de Torquemada] {de Torquemada}
[Martinez] {Martinez}
[DZaz Bermejo] {Díaz Bermejo}
[Sabbah] {Sabbah}
[al-Din Zengi] {al-Din Zengi}
[Timurtash] {Timurtash}
[al-Din Aibak] {al-Din Aibak}
[Evrenos] {Evrenos}
[de Lauria] {de Lauria}
[de Montaigu] {de Montaigu}
[de Vergy] {de Vergy}
[Hunyadi] {Hunyadi}
[Tepes] {Tepes}
[Tverdislavich] {Tverdislavich}
[of Verona] {of Verona}
[of Rome] {of Rome}
[de Monte Corvino] {de Monte Corvino}
[di Rienzo] {di Rienzo}
[Alvarez Carillo] {Alvarez Carillo}
[de Hauteville] {de Hauteville}
[de Flor] {de Flor}
[Tell] {Tell}
[von Malters] {von Malters}

Note that more surnames exist, i suppose only unique names that don't occur elsewhere are in the hero name, so more heros may exist and they may get the wrong first name, but there are quite a few in this list i have seen before.