The simplest one is ethylene, with just two carbons.
Others are named systematically with the "-ene" suffix, though "-ylene" persists for some of the smaller ones: propene/propylene, butene/butylene, pentene, hexene, ...
The general formula for unsubstituted alkenes is CnH2n
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H H H
H H H H H
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H H H H H H H H
1-Butene C4H8 2-Butene C4H8
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