Namesakes
Austrian Dukes and Emperors:
1 archduke
Archduke Matthias 1608-1619 
Biblical Characters:
1 character
Matthias (m) Acts 1:23
Bohemian Kings:
2 kings
King Matyáš Korvín (a.k.a. Matthias) 1469-1490
King Matyáš II (a.k.a. Matthias) 1611-1617
German Kings and Holy Roman Emperors:
1 king-emperor
King-Emperor Matthias 1612-1619
Hungarian Kings and Queens:
2 kings
King Mátyás Corvinus the Just (a.k.a. Matthias) 1458-1490
King Mátyás II (a.k.a. Matthias) 1608-1618
Notable Actors and Entertainers:
1 actor
Melvil Poupaud (middle name Matthias) 1973-
Notable Artists:
1 painter
Matthias Grünewald c. 1470-1528
Notable Athletes:
4 soccer, 1 skiing
(soccer) Matthias Sindelar 1903-1939
(soccer) Matthias Jaissle 1988-
(soccer) Jonas Hector (middle name Matthias) 1990-
(skiing) Matthias Mayer 1990-
(soccer) Matthias Ginter 1994-
Olympic Medalists:
1 bronze/gold, 1 gold
(bronze/gold) Matthias Witthaus 2004; 2008; 2012 field hockey
(gold) Matthias Mayer 2014 alpine skiing
Saints:
5 blessed, 4 saints
Saint Matthias ?-80
Saint Matthias of Jerusalem ?-120
Blessed Matthias of Arima 1571-1620
Saint Mathias of Miyako (a.k.a. Matthias) ?-1597
Blessed Matthias Kosaka ?-1619
Blessed Matthias Nakano ?-1619
Blessed Matthias of Arima ?-1622
Blessed Matthias Araki ?-1626
Saint Matiya Mulumba (a.k.a. Matthias) 1836-1886
Swiss Presidents:
1 president
Wilhelm Matthias Naeff 1853