Persons now owning or conducting such business under an assumed name, or under such designation referred to in section 1, shall file such certificate or renewal certificate as hereinbefore prescribed, within 90 days after this act shall take effect and after 30 days’ notice from the county clerk, and persons hereafter owning, conducting or transacting business as aforesaid shall, before commencing said business file such certificate in the manner hereinbefore prescribed. The several county clerks of this state are hereby authorized to reject any assumed name which is likely to mislead the public, or any assumed name already filed in the county or so nearly similar thereto as to lead to confusion or deception.