There are two matters for us to consider.The first is that of the association of Alhamisi with religious connotations and if that is only specific to Kiswahili language (community); and the second is if the borrowing of Alhamisi is linguistically well motivated even for that purpose. For both these matters, we shall be comparing the Kiswahili calendar with that of its neighbours to determine what we think is a discrepancy, especially, with the Kiswahili borrowing of Alhamisi. We shall discuss the issues above and others in this paper as follows. In the following section we shall, briefly, consider the basis of the formulation of some week calendars.This will be followed by the consideration of the week calendars of a number of languages in East Afiica. Lastly, we shall focus specifically on the Kiswahili week calendar; comparing it with the others and drawing our conclusion.