Hello, Quarcoo!

With regard to your comment that "{Western} names are modification of other names, yes that is true for many names. Of course, it depends on what you mean by "western names" since many names used in the USA and European countries are from Hebrew and other languages that technically aren't from "Western" nations.

Some modifications of names are made to denote gender {female names from male names}. For instance, the female names "Georgia" and "Georgette" from "George".

African Americans seem to take pleasure in modifying names. The most common strategy for modifying names is by making minor {or major} changes in the spelling of the name.

Some personal names are also modified by adding prefixes {beginning elements such as "La" and "De" and/or suffixes such as ia" or "te" or "isha". Some of these elements are usually reserved for females {such as "La", and "ia" and "isha". The rule for male names appears to be not as firm, "De" and "te" {tay} can be used for either male or female names.

Since the 1980s, an increasing number of African American personal names have been modified by using capitol letters, and/or by using an accent mark, or a hyphen.

Example of some contemporary "African American" * modifications of female names:

Keisha

Kesha

Keisha

Keysha

LaKeisha

La-Keisha

MyKeisha

BTW, the base of this name may come from a Hebrew female name that Imeaning "cinammon [or other "fragrant smell" or an African female name meaning "favorite daughter".

* Of course, these names can be used by non-African Americans. But I believe that the source of the modifications is African American.

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Quarcoo, with regard to your question about the meaning of "Choctaw, Cherokee, Chickasaw", these are group names for American Indians {Native Americans; Indigenous Americans}. I don't know their specific meanings.