Alla is a given name

Given name

A given name, in Western contexts often referred to as a first name, is a personal name that specifies and differentiates between members of a group of individuals, especially in a family, all of whose members usually share the same family name...

, now widespread throughout all Slavic nations. The name is presumably of Scandinavian origin. The Orthodox Christian Church usually relates the name with saint Alla, the widow of Gothic chiftain, martyr

Martyr

A martyr is somebody who suffers persecution and death for refusing to renounce, or accept, a belief or cause, usually religious.-Meaning:...

ed in the King Athanaric

Athanaric

Athanaric was king of several branches of the Thervingian Goths for at least two decades in the fourth century. His name, Athanareiks, means "Year King" or "King for the Year" comes from the Gothic word Athni meaning "year" and the Gothic Reiks meaning "king."A probable rival of Fritigern, another...

's times.

Since the name is also spread among Tatars

Tatars

Tatars are a Turkic speaking ethnic group , numbering roughly 7 million.The majority of Tatars live in the Russian Federation, with a population of around 5.5 million, about 2 million of which in the republic of Tatarstan.Significant minority populations are found in Uzbekistan, Kazakhstan,...

, there is some speculation that the name has its origin in preislamic goddess Allat

Allat

' or ' was a Pre-Islamic Arabian goddess who was one of the three chief goddesses of Mecca. She is mentioned in the Qur'an , which indicates that pre-Islamic Arabs considered her as one of the daughters of Allah along with Manāt and al-‘Uzzá....

.

The name Alla is also widespread in Iceland

Iceland

Iceland , described as the Republic of Iceland, is a Nordic and European island country in the North Atlantic Ocean, on the Mid-Atlantic Ridge. Iceland also refers to the main island of the country, which contains almost all the population and almost all the land area. The country has a population...

.