1) We find in Tanach names of people that are identical to names of places.
For example: Ephras is the place where Rachel Imeinu died and was buried
(Bereishis 48:7). This name also appears in I Divrei HaYamim 2:19,
as the name of Calev’s wife. Similarly, Edom, the name of a place, is
mentioned in Parshas Toldos as the name of Esav. There are other similar
cases.
2) Nowadays, there are some newly-invented names, used mainly in Eretz Yisrael,
that are both names of places, and names of people. For example, the masculine
names Arnon, Givon, Geva; and the feminine names Kineres, Eilas, Carmella, etc.
3) Some say that one should not give his son two names, one of which is also the
name of a place, such as Reuven Chevroni, for this may later result in legal
problems.