Clan MacKay Septs
The following names are agreed septs of Clan MacKay:
| Allan | Allanson | Bain | Bayne |
| Kay | Key | Keyes | MacAllan |
| MacBain | MacCaa | MacCaw | MacCay |
| MacGaa | MacGaw | MacGee | MacGhee |
| MacGhie | MacKay | MacKee | McKee |
| McKie | Mackie | MacPhail | MacQue |
| MacQuey | MacQuoid | MacVail | MacVain |
| MacVane | McCay | McCoy | McKay |
| McKoy | Morgan | Neilson | Nelson |
| Paul | Pole | Poleson | Pollard |
| Polson | Reay | Scobie | Williamson |
The following names are less well documented but are still seen as septs of Clan MacKay
| Aberach | Abrach | Aed | Allan |
| Allen | Aoidh | Aue | Ave |
| Ay | Aye | Ayson | Bain |
| Baine | Baines | Bane | Bayin |
| Bayn | Bayne | Baynes | Baynne |
| Bean | Beanes | Beine | Bene |
| Bhaine | Cay | Caw | Coid |
| Coy | Eason | Easson | Esson |
| Eye | Faill | Fall | Ghie |
| Gilliam | Heth | Iye | Kae |
| Kay | Keay | Kee | Keye |
| Keyes | Keys | Kie | M’Cay |
| M’aKie | M’Gy | M’Kay | M’Kee |
| M’Ky | Mac’Key | Mac’Ky | Macaedh |
| Macaedha | Macaenghusa | Macahay | Macajee |
| Macai | Macakey | MacAllan | MacAllen |
| MacAidh | MacAiodh | MacAodha | MacAoidh |
| MacAth | MacAw | MacAy | MacBain |
| MacBayne | MacCa | MacCaa | MacCaid |
| MacCaidh | MacCaoidh | MacCaw | MacCawe |
| MacCay | MacCee | MacCey | MacCie |
| Maccky | Maccoy | MacCoid | MacCoy |
| MacCue | MacDhia | MacEda | MacEke |
| MacEth | MacEthe | MacFaell | MacFail |
| MacFal | MacFale | MacFall | MacFaul |
| MacFauld | MacFaull | MacFayle | MacFoill |
| MacFyall | MacGaa | MacGaughey | MacGaw |
| MacGay | MacGe | Macgee | Macgeehee |
| Macghee | Macghie | MacGye | MacHeth |
| MacIdh | MacIeie | Macilvain | MacIsall |
| MacIye | MacKa | MacKaa | MacKaay |
| MacKai | MacKau | MacKaw | MacKawe |
| MacKay | MacKaye | MacKaw | MacKCoy |
| MacKe | MacKeay | MacKee | Makees |
| MacKeiay | MacKeiy | MacKer | MacKew |
| MacKey | MacKhee | MacKiewicz | MacKie |
| MacKieson | MacKiye | MacKkcee | MacKcie |
| Makke | Makkee | Makkey | Makkie |
| Makkoy | Makky | Mca | Mcacay |
| Mcay | McBain | McBayne | McCa |
| McCaa | McCaw | McCay | McCee |
| McCie | McCoy | McCoye | McEy |
| McFall | McFaul | McGe | McGee |
| McGeiiee | MacKphaill | MacKy | MacKye |
| MacPaill | MacPaul | MacPhael | MacPhaell |
| MacPhail | MacPhaile | MacPhaill | MacPhale |
| MacPhaul | MacPhaull | MacPhayll | MacPhell |
| MacPhial | MacPhiel | MacQha | MacQua |
| MacQuade | MacQuaid | MacQuey | MacQuhae |
| MacQuid | MacQuiod | MacVail | MacVale |
| MacWhaugh | MacWhaw | MacWhey | MacWhy |
| MacYe | Makaw | Makay | Makca |
| Makcaw | Makcawe | Makcoe | Makfaill |
| Makfale | Makfele | Makie | Makkaw |
| Makkcae | Makke | Makkee | Makkey |
| Makkie | Makphaile | Maky | Morgan |
| Morgund | Murgan | Neelson | Neillsone |
| Neilson | Neilsone | Neilsoun | Neilsoune |
| Neleson | Nelesoun | Nelson | Nelsone |
| Nelsonne | Nelsoun | Neylsone | Nickphaile |
| Nielson | Nilson | Nilsone | Nilsoune |
| Nylson | Pal | Paul | Paule |
| Paull | Paulson | Paulsoun | Poilson |
| Poilsone | Poilsoun | Pol | Pole |
| Poleson | Pollsoun | Polson | Polsone |
| Polsoun | Polsun | Polyson | Polysoun |
| Poulson | Quaid | Quay | Quoid |
| Strathnaver | Vail |