alliteration
al·lit·er·a·tion
/əˌlıtəˈreıʃən/ noun [ noncount ]
: the use of words that begin with the same sound near one another (as in wild and woolly or a babbling brook)
al·lit·er·a·tive /əˈlıtərətıv/ adj
an alliterative name like “Molly Mason”