I don't think there is one. There is a type of Waterbuck (a type of Antelope) that is called the Lechwe, maybe that is what you are thinking of?
Websters says it is a Topi, plural Topis
Royal antelope
reindeer
springbok
Reebok.
Lesser Kudu
Addax is an antelope species in Africa. It begins with the letter a.
the pronghorn antelope
Topi
Topi or Tsessebe Tibetan antelope
oribi
Deere
impala
Impala
gemsbok
Elands
The name of an antelope that begins with the letter G is a gazelle. There are six species of gazelle who live mostly in Africa.