The G in GCF stands for greatest. The -est suffix means that it is a superlative - that means there can be only one.
So, any set of numbers can have only one GCF.
The GCF of (3, 16, 18) is 1.
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The GCF of 16, 18, and 36 is 2.
The GCF is 2.
The greatest common factor of 18 and 55 is 1.
The greatest common factor of 39 and 18 is definitely 3.
The GCF is 2.