Liam itself is a nickname, and it’s kind of hard to shorten, unless you wanna go with Li. (Or Am — how existential.)
Famous people named Liam:
Actors Liam Hemsworth and Liam Neeson; singers Liam Gallagher and Liam Payne.
If you flip it around, it spells “mail.” So that’s … neat. Tori Spelling, Harrison Ford, and Rod Stewart must also think it’s neat, since they all have Liams.
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