Jas = james
Jos usually = joseph
'o' and 'a' easily confused
The Manx museum has a register of Manx shipping - I doubt if a 60year old boat made it to Dunkirk - name is quite common (eg Nemo's famous sub)
The following Wades are on boats in 1881 -
Henry 25 V-"Mary Alice" 9 Fisherman (German) Peel
John 25 V-"Lilly" 172 Fisherman (German) Peel
Wm.E. 14 V-"Antoinette" 101 Fisherman Patrick
Edward 14 V-"Lily" 172 Fisherman Patrick
Joseph 18 V-"Choice" 1 Fisherman Patrick
Jas. 26 V-"Nautilus" 26 Miner Patrick
Evan 23 V-"Tartar" 90 Fisherman German
James 32 V-"William" 16 Fisherman German
Robert 55 V-"Lilly" 172 Fisherman German
John 27 V-"Rover's Belle" 177 Fisherman Andreas
John James 17 V-"Agnes Maria" 190 Fisherman Lezayre
George 18 V-"Leader" 133 Fisherman Lonan
Thomas 26 V-"Zebra" 10 Labourer (Malew) Castletown Arbory
William 18 V-"Mona's Belle" Of Ramsey Fishing Lugger Fisherman Ramsey Lezayre Sulby