Jerry D. Grover, Jr., proposes various Sumerian and Hebrew etymologies for the name "Angola" in the Book of Mormon.
Jerry D. Grover, Jr., Sumerian Roots of Jaredite Derived Names and Terminology in the Book of Mormon (Provo, UT: Challex Scientific Publishing, 2017), 356–57
Hebrew
ANGOLA is the name of a NEPHITE city. If the name is from a HEBREW root, it may be a combination of words, since the HEBREW letter nun is contact with any other consonant within a word would make it subject to "progressive assimilation" or "regressive assimilation" (i.e., "ng" or "gn" becomes "gg"). Thus, the name may derive from the HEBREW word ʿayn, "spring, well," and a word from the root GLH, "to uncover, reveal" or GLL, with the basic meaning of "to roll, roll away (a rock or stone)." A combination of ʿayn plus a form of either of the roots may generate the names "Open Spring" or "Rock Spring." An EGYPTIAN etymology is also possible, as is one from an indigenous language.
(Book of Mormon Onomasticon 2016)
Angolah is a city identified late in the Book of Mormon in the final conflict as the Nephites were retreating. The Nephites took possession of the city and made preparation to defend themselves, fortifying the city “with their might” but the Lamanites successfully drove them out of the city (Mormon 2:4). Reasonable etymological units for Angolah are:
Sumerian
Event Descriptor units
A: a weapon or a leather holder for a weapon
an: sky, heaven; upper; crown (of a tree)
an-na-ĝu10 (form of an)
gal: (to be) big, great
gu-la, gal-la, gal-a, gu-la2 (form of
gal)
ĝal: to be (there, at hand, available); to exist;
to put, place, lay down; to have
ĝal2-la, ĝal2-a (form of ĝal)
ĝal: to guard, protect
gu: force
gul: to destroy; to break; to flatten; to carve,
cut
gul-la, gul-a, an-gul-a-ni, nu-gul (form
of gul)
GUL: a designation of chariots
u: defeat
ul: vault of heaven, firmament
ul: greatly
ul: to hasten, (be) quick; (to be) early
ul4-la (form of ul)
ul: terror
ula: battle
ula: (to be) feeble
la: to press, throttle
he: be it
Constructed Compound Word: Angolah(e)
Geographical Description units
a: water
a-ni, a-na (form of a)
an: sky, heaven; upper; crown (of a tree)
an-na-ĝu10 (form of an)
anaĝ: drink
angal: spot, marking
gu: bank, side; neck
u: earth pile
U: type of stone
ul: vault of heaven, firmament
ul: fruit; bud
ul-la (form of ul)
la: flooding
he: be it
Constructed Compound Word: Angolah(e)
Hebrew
ʿayn: spring, well
GLH: to uncover, reveal
GLL: to roll, roll away (a rock or stone)