For instance, are they cousins? A nephew?? You do know that the "D" in Lachlan M.D. Cranswick stands for 'David' --- as in Lachlan Michael David Cranswick.
Shakespeare and Islam: Good Neighbors? - IslamOnline.net - Art & Culture
....By 3 p.m. it was time for a talk on "Art and Alchemy" by Mr. David Cranswick, who is a traditional painter with a doctorate from the Prince of Wales Institute in London. The word alchemy comes from the Arabic word al-kimiya or al-khimiya, meaning cast together, or pour together, or weld, or alloy, and so on. The main element from this talk was the organization of colors with the help of the seven visible planets: That is, Mars, for example, carries colors from ochre to brown and Venus carries colors such as blue and green. Could that be where John Gray got his inspiration from when he argued that "Men are from Mars, Women are from Venus"?
What is the derivation of the word alchemy ?
There are three main ideas about the origin of the word alchemy. Firstly, from ancient Egyptian transmitted through Arabic ‘al-khem’, from the Egyptian hieroglyphics
Km.t which form the native name of Egypt, ‘Chem’, meaning ‘black earth’. Thus one derivation of the word alchemy is the ‘Egyptian art’, or the ‘art of the black earth’.
The second derivation is from the Greek word ‘chemeia’, found in the writings of Diocletian, the art of making metal ingots.
The third derivation is from the Greek word ‘chumeia’, the art of extracting juices or infusions from plants, and thus herbal medicines and tinctures. From ‘chumos’ meaning juice.
http://www.levity.com/alchemy/faq.html
You have to remain a little sceptical of muslim claims, islam maintains that muslim arabs founded TALLAHASSEE because the word has ALLAH in it.