(3) References in this Act to a former Christian name or surname shall not include a former Christian name or surname where that name or surname has been changed or disused before the person bearing the name had attained the age of eighteen years, and, in the case of a married woman, shall not include the name or surname by which she was known previous to the marriage. (4) References in this Act to a change of name shall not include a change of name which has taken place before the person whose name has been changed has attained the age of eighteen years; or, in the case of a peer or a person usually known by a British title different from his surname, the adoption of or succession to the title. (As amended by No. 13 of 19 of 1950 and S.I. No. 5 of 1965) 3. Subject to the provisions of this Act(a) every firm having a place of business in Zambia and carrying on business under a business name which does not consist of the true surnames of all partners who are individuals and the corporate names of all partners who are corporations without any addition other than the true Christian names of individual partners or initials of such Christian names; (b) every individual having a place of business in Zambia and carrying on business under a business name which does not consist of his true surname without any addition other than his true Christian names or the initials thereof; (c) every individual or firm having a place of business in Zambia, who, or a member of which, has either before or after the commencement of this Act changed his name, except in the case of a woman in consequence of marriage; shall be registered in the manner directed by this Act: Provided that(i) where two or more individual partners have the same surname, the addition of an "s" at the end of that surname shall not of itself render registration necessary; and (ii) where the business is carried on by a trustee in bankruptcy or a receiver or manager appointed by any court, registration shall not be necessary; and (iii) a purchase or acquisition of property by two or more persons as Firms and persons to be registered