The 1927 Glasgow Phone directory contains a number of McLays and McLeas.

http://freepages.genealogy.rootsweb.com/~glasgow/index-glas.htm

In particular, these two pages:
http://freepages.genealogy.rootsweb.com/~glasgow/1927names449.jpg
http://freepages.genealogy.rootsweb.com/~glasgow/1927names451.jpg

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