The topics discussed in this paper are the definition of onomastics, the problem of understanding what proper names are and how they can be distinguished. Two basic types, anthroponyms (names of people) and toponyms (place-names) are in the further text discussed in more detail. Prior to that, some relevant sources naming both personal and place names are stated. These sources are divided according to three periods: Old English, Middle English and Modern English period. The most important one is Doomsday Book which is the prime- source for Old English and early Middle English people and place names. After that, personal names and their development (or how they came into English language) are stated. They are also split in three periods. Cec...