Young's Farm is the local name, Dalmoak Farm the map name. Other contributors' earlier pictures:
NS3876 : Dalmoak Farm /
NS3876 : Dalmoak Farm from the A812. For the burn, see
NS3876 : Whiteleys Burn passing Dalmoak Farm.
The Blaeu map of the Lennox (1654), based on surveys c.1580s—90s, shows a "Dalmowack Farm" here (and a "Mains" that is nearer the river — see below). For early charters relating to the Dalmoak lands, see
NS3877 : Dalmoak House.
An 1832 plan of Dumbarton prepared in connection with the Great Reform Act shows a Dummock Mains Farm (Dalmoak Mains), but it appears to correspond to Main of Cardross Farm, which is now long gone, but which was still in existence when the first-edition OS map was surveyed in 1860:
NS3976 : Site of Mains of Cardross Farm.
Likewise, the "Damock Mains" shown on a "Map of the Shire of Dumbarton" (1777) by Charles Ross is probably Mains of Cardross. A "Dumock" further from the river is shown separately on that map, and its position corresponds more closely to that of the present-day Dalmoak Farm (or nearby Dalmoak House).
Roy's slightly earlier Military Survey of Scotland (c.1740s—50s) also distinguishes between "Mains", right beside the River Leven, and a harder to read version of the name Dalmoak ("Damuach"?) a little further away.