The first name Shea comes from Séaghdha, which, according to Mike Campbell's Behind the Name, probably comes from the Gaelic for admirable or hawk-like.
In the case of Atlanta Braves star Chipper Jones's son Shea ... he's named after Shea Stadium, the stadium where Chipper repeatedly devastated the New York Mets.
Shea Stadium was named after William Shea, the lawyer who helped bring National League baseball (though generally neither admirable nor hawk-like baseball) back to New York.
"Shea" is of Gaelic origin and means "admirable" or "hawk-like." "Lynn" is of English origin and means "lake" or "waterfall." Therefore, the name Shea Lynn could be interpreted as "admirable lake" or "hawk-like waterfall."
No. It's a modern combination of the popular elements of Shay- + -Lyn. Shea/Shay is an Anglized version of the Irish name Séaghdha, but just adding the English -lynn to an Irish name doesn't mean it's still Irish.
Beth Shea's birth name is Elizabeth Ann Shea.
Gloria Shea's birth name is Shea, Olive Gloria.
Luke Shea's birth name is Luke Patrick Shea.
Marty Shea's birth name is Martin Christopher Shea.
McKenzie Shea's birth name is McKenzie Shea Walsh.
Shorty Shea's birth name is Donald Jerome Shea.
Specs Shea's birth name is Francis Joseph Shea.
Shea Hillenbrand's birth name is Shea Matthew Hillenbrand.
Jerry Shea's birth name is Jerry Ray Shea.
Siomon Shea's birth name is Blakeston Presley Shea.