You may already know this, but there are records for what appears to be this Igoe family in the FamilySearch database. If you're familiar with that database (https://www.familysearch.org), then you can find Mary Ellen Igoe at ID number LTJ8-95T, with her birthdate listed as 11 July 1899. Her parents are listed, but no earlier records have been linked to them thus far. At that site, you can see the screen name of the person who has input the information, and are able to send an internal message to the person, in case you want to discuss the family.
You probably already have some of the following info, but you mentioned in your last message above that you're looking for information in Swinford, so I thought I would mention that place names used in official records can be confusing at times. Larganmore (in Irish, An Leargain Mhór) is a townland in the Catholic parish of Killasser, and is in the civil parish of the same name (Killasser), and you can see more info about it here: https://www.townlands.ie/mayo/gallen/killasser/callow/larganmore/
However, Larganmore is also in the electoral district of Callow. That can be confusing, because there is also a townland named Callow in Killasser parish, a bit to the southeast of Larganmore. My grandmother, as it happens, grew up in the townland of Callow.
To make things even more confusing (at times), when civil birth records began in the 1860's, they were recorded by registration districts which cover larger areas than just one parish (often, a number of parishes are included). For Killasser, the civil registration district was Swinford/Swineford, which is the name of the town just south of the parish of Killasser. So, when one finds a civil birth record listing a birth in Swinford, that does not necessarily mean that the child was born in the parish of Swinford (sometimes referred to by the parish name of Kilconduff), although sometimes the civil record will also list the actual parish (or even townland) of the child's birth.
The Catholic parish records which are available online for Killasser, which go back to 1847, can be found at this link: https://www.townlands.ie/mayo/gallen/toomore/toomore/leckee/
Leckee (in Irish, Leic Aodha) is, as noted in one of the messages above, in the Catholic parish of Toomore, and the civil parish of the same name, just to the west of the parish of Killasser, and you can find more info about it here: https://www.townlands.ie/mayo/gallen/toomore/toomore/leckee/
Leckee is also in the electoral district of the same name. The civil registration district for Leckee, though, as for Killasser, is Swinford.
The Catholic parish records which are available online for Toomore, which go back to 1833 for marrriages and 1870 for baptisms, can be found at this link: https://registers.nli.ie/parishes/0131