Boys names starting with M

So we have a 6 month old son, and we're 8-ish weeks pregnant. We don't know the gender yet, but our names are Matthew, Brittany and Brantley. Our son is Brantley Oliver, which goes well with my name. For this one we have a girls name picked out: Madisyn Elaine. We're having trouble picking out a boy's name starting with M. The middle name would be Sinclair, and last initial is W. We like Scottish names and names that are common but not way overused. Also names with alternate spellings. Names we're considering:

Masyn

Myles

McCoy