The term Somalian is an incorrect Anglicization for referring to the ethnicity or nationality of Somali people. The correct demonym is Somali just like the language, and is the term Somali peoples use to refer to themselves in the Somali language.
Somali may refer to:
Something of, from, or related to Somalia
Somalis, an ethnic group
Somali language, a Cushitic language
Somali cuisine, traditional cuisine
Somali cat, a cat breed
HMS Somali (F33), a British destroyer