Barn or granary
Lathyn is a modern phonetic variant of the English surname Latham. It originates from Old Norse and Old English words referring to a barn or a collection of storehouses.
Less common today
Lathyn isn't in the latest US Top 1000. It last peaked at #7,956 in 2011.
US births per 5-year period, 1990βpresent (SSA data).