Twin vs Alba

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Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.

In contrast, a fetus that develops alone in the womb (the much more common case, in humans) is called a singleton, and the general term for one offspring of a multiple birth is a multiple. Unrelated look-alikes whose resemblance parallels that of twins are referred to as doppelgangers.

Source: Wikipedia

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Alba (English: ) is the Scottish Gaelic name (pronounced [ˈal̪ˠapə]) for Scotland. It is cognate with the Irish term Alba (gen. Alban, dat. Albain) and the Manx term Nalbin, the two other Goidelic Insular Celtic languages, as well as contemporary words used in Cornish (Alban) and Welsh (Yr Alban), both of which are Brythonic Insular Celtic languages.

(The third surviving Brythonic language, Breton, instead uses Bro-Skos, meaning 'country of the Scots'.) In the past these terms were names for Great Britain as a whole, related to the Brythonic name Albion.

Source: Wikipedia