Cal. Bus. & Prof. Code § 6738
(a) This chapter does not prohibit one or more civil, electrical, or mechanical engineers from practicing or offering to practice within the scope of their license civil (including geotechnical and structural), electrical, or mechanical engineering as a sole proprietorship, partnership, firm, or corporation (hereinafter called business), if all of the following requirements are met:
(f) A business engaged in rendering civil, electrical, or mechanical engineering services may use in its name the name of a deceased or retired person provided all of the following conditions are satisfied:
(h)