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This should be in the opinions board. You can use both in different circumstances. E.g. a professional name (your brand) and a legal name (which asserts mainly financial and inheritance rights - not strictly necessary, but it can simplify discussions). There is also the personal question of whether you are marrying into his family, or is he marrying into yours? This is also a matter of "branding" (in the marketing sense). It may be desirable to maintain a sense of family continuity or identity that would otherwise be lost; or on the other hand to make a deliberate break and a new beginning and new identity.