1. the ecology 1 club

2. the ecology club 1

(The name is one of the club names. Which one is correct? are both OK?
Is there any difference between them?)

We don't usually use numbers in club names, so I don't know what these numbers represent.

The one that sounds best (or most closely American) to me is the Ecology 1 Club.

1. the ecology 1 club

2. the ecology club 1

There are many people, so when one club is separated into two clubs, we can name this way: the ecology club 1, the ecology club 2....

Which expression do I ahve to use?

In that case, the better term would be Ecology Club 1.

Thanks for clarifying it. :-)

Both "The Ecology 1 Club" and "The Ecology Club 1" can be considered as valid club names, but there might be subtle differences in their meaning depending on the context.

1. "The Ecology 1 Club":
Here, "Ecology 1" might refer to a specific type or level of ecology, suggesting that this club focuses on a particular aspect of ecology. For example, it could be an introductory club for beginners or a specialized club for studying a specific ecological topic.

2. "The Ecology Club 1":
In this case, "Club 1" could indicate that there are multiple ecology clubs in existence, and this particular club is the first or original one. The number "1" could also indicate that it is part of a series of clubs with similar names or themes.

Ultimately, the specific meanings of these club names can only be confirmed or fully understood by consulting the club organizers or members. It's important to note that club names can vary greatly, and it's possible that both names might not align with these interpretations.