Aloe aristata * - 'Aristata' means 'awned' which refers to the leaf-tips that awn-like. Aloe aristata is commonly known as 'Serelei' which means slippery one. Aloe aristata does well in gardens specially gardens and containers.
Aloe bowiea * - Aloe bowiea is named after James Bowie an early plant collector. An easy to cultivate specimen, especially for rockery and container growth.
Aloe brevifolia * - The specie name 'brevifolia' means 'short leaves' and it refers to the short stubby leaves of the plant. Aloe brevifolia thrives in well-draining soil and makes a welcome attraction to any garden. Common names include 'Duine -aalwyn' (Dune Aloe) and Kleinaalwyn (Small Aloe).
Aloe humilis * - Aloe humilis was named after it low growing habit, from which the specia name was derived. 'Humilis' means 'low growing'. Grows well in cultivation especially in containers. Commonly called the Spider Aloe.
Aloe longistyla - The specie name 'longistyla' refers to the long style that visibly protrudes from the flower mouth. The Afrikaans common name is 'Ramenas'. Aloe longistyla is difficult to cultivate and specialist care is required.
Aloe variegata * - This aloe received its name,'Variegata', from the variagation on the leaves. Common names include Partridge Aloe and 'Kanniedoo' which means 'cannot die' when translated. Aloe variegata is a relativley easy specie to cultivate.

Aloes of Southern Africa I use the book "Guide to Aloes of Southern Africa" by Ben-Erik van Wyk & Gideon Smith as a reference quite often. If you are a Aloe enthusiast and you don't have this book I highly recommend it.