is it permissible for a Muslim living in west to change last name from Muhammad to another Islamic surname from their father's family side solely cuz they suspect, though don't know for sure, that they cant get job due to islamophobia and discrimination because of their name Muhammad.

Ustadh AbdulAziz al-Haqqan

Generally in Islam, it is not allowed to attribute yourself to someone else who is not your father and the family is not your lineage. However, specifically in regards to your question, I do not know the answer. Allah knows best.