In legal practice, an alias is any name or style a person uses that is not their current legal name. It is recorded to ensure accurate identification in criminal proceedings, civil claims and regulatory checks. The term is descriptive rather than statutory; courts, police and prosecutors commonly denote aliases as “also known as” (AKA) or “otherwise known as”. Inclusion on indictments, charge sheets, warrants, judgments and court orders links records, attributes previous convictions, and reduces mistaken identity. Recording an alias does not effect a change of name; a change of name depends on evidence of use or a formal instrument (for example, deed poll or statutory declaration). Using an alias is not unlawful per se, but use intended to deceive or obstruct may constitute offences (such as fraud, identity document offences, or perverting/obstructing justice), and may affect bail, sentencing or immigration decisions. In drafting and due diligence (KYC/AML, sanctions, insolvency), list known aliases for service and enforcement; trading names are not strictly aliases. Usage is broadly consistent across England and Wales, Scotland, Northern Ireland and Ireland, with only minor variations in wording.