A number of Lithuanian surnames evolved from the ancient pre-Christian Lithuanian personal names, such as Budrys, Girdenis, Tylenis, Vilkas, Amantas, Bukantas, Rimgaila, Vizgirda, Tarvydas. Many of them are of compound type, typically consisting of two stems, and many are of single stem. Sometimes the order of these stems may reverse, e.g., Norvaišas vs. Vaišnoras, Tautvydas vs. Vytautas.