Is the naming of colours subjective?

I've always considered teal to be a green shade. Wikipedia describes teal as blue-green, saying it can be created by mixing blue into a green base.

I have, however, seen items of clothing described as teal when they are far closer to emerald green!

I also know this anyway because teal is DD2’s favourite colour for clothing. So we've done all the shade tests imaginable.

I just looked up teal duck on wiki. Teal green is definitely a shade of green. A special shade of green, yes, but definitely green hue.

Turquoise is much bluer.

I agree there is a marginal difference between concepts of shades of a colour. I imagine it's up to the manufacturers, but teal isn't green to me. I have the same problem with the different shades of aqua.