It is not prohibited to
name your baby 'Husamullah'. However, it is better to give him a name that shows his servitude to Allah (Exalted be He) such as `Abdullah or `Abd-ul-Karim. Similarly, it is preferable to give him one of the renowned Islamic names like Muhammad, Ahmad, Salih, or Sulayman (Solomon).May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.