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Kind of exactly how I've shown you.

A="abc"
B="def"

read $A$B <<<"string" ...should put the string "string" into the variable named abcdef.

This is how it's often used: read VARNAME ...but...

This is easiest done with read. It's handy because it takes a variable name, which you can construct by any means you want.

read $A$B <<<"string"

Because if $path is obtained from user input or an input file, or otherwise not under your control someone could execute code with the permissions of the person executing the script.

If you are...

A not-recommended way:
eval echo \$leg$path
By the way, I think you meant echo ${!var} instead of echo ${!leg}.