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Moynalvy is a townland in the civil parish of Kilmore. Kilmore is just to the southeast of Laracor parish (see reply to your Malone message). The 1853 Griffiths Valuation head of household listing for Kilmore parish did not show any Fitzsimmons records.
The 1901 census for Moynalvy townland did list a Martin Fitzsimons family. See link.
By the 1911 census Martin had died but his wife and five sons were in Moynalvy.
So if any of the sons stayed and married, there may still be descendants in Moynalvy.
Castlemore Roscommon, IrelandXO Volunteer ☘