Examples from the Web for ethane
Add another of carbon and two more of hydrogen and you get the second "Ethane."
All we need trouble about, however, is the first two, Methane and Ethane.
Ethane, (C2H6), a hydrocarbon belonging to the paraffin series.The New Gresham Encyclopedia|Various
We have pictured to ourselves the molecule of methane: let us do the same with ethane.
We derived this substance from ethane by introducing a methyl group; hence it may be termed “methylethane.”