In English, the common name for computer is "computer", pronounced /k_m_pju_t_r/, where "com" is pronounced /k_m/, " pu" is pronounced /pju_/ and "ter" is pronounced /t_r/.
If you need to describe the type or brand of computer, you also need to pronounce it according to the specific name. For example, "Macbook" is pronounced /m_k b_k/, "ThinkPad" is pronounced /θ__k p_d/, and so on.