Don't know if the Lawsons masts were but many ships with 6 or more masts (Of which there wern't very many)were named for the days of the week
A BIT OF USELESS INFOMATION FOR YOU; SAID TO BE A TRUE STORY ..BRUNEL'S GREAT EASTERN On her Maiden Voyage a female passenger was walking the deck when she stopped to ask a question from an old AB who was sitting on a set of bits splicing a rope ..I say fellow,she said, I have often sailed on my Husbands ships and know the ways of ships but I cannot fathom out how you name the masts of a ship with 6 masts ... The old AB looked up and tugging his forelock as a mark of respect answered ...Mum, we name the masts after the days of the week , The fore mast is named Monday, the next is Tuesday and so on ... Oh very good ,thank you, she said and turning away to resume her walk she suddenly stopped and turned back to the AB and said "BUT why is the foreward mast named Monday for isn't Sunday the first day of the week "
The Old AB again respectfully tugged his forelock and said "Aye me lady, Ashore it is ... But there is no such thing as a Sunday at sea, for every day here is a working day".
From "Tails of Brunel's Great Iron Ship"
Jimmy