I found the following listing for Mc's in Ohio in the 1850 and 1860 Census Indexes. 1850 McElravy, DavidHarrison Co ,Archer Twp roll 693 pg 468 McElravy, HughHarrison Co, Archer Twp roll 693 pg.468 McElravy, JohnHarrison Co. Archer twp.roll 693 pg 468
McIlravey, RobtTUUN 321 (dont'have code for this Co.) McIlravey, Wm.TUWR 291 McIlravy,Alex Harrison Co. Short Creek Twp. roll 693 pg.482 McIlravy,Daniel Harrison Co.Short Creek Twp roll 693 pg"
1860 McIlravey,Jane Harrison Co. Archer Twp roll 693 pg 148 McIlravey,Margt Harrison Co.ShortCreek Twp roll 693 pg 51 McIlravy, Alex JeffersonCo. Mt PleasantTwp. roll 699 pg192 McIlravy, George Harison Co. (can't read twp)roll693 pg 15
This puts an Alex and Daniel in Ohio in the 1850's-1860's I hope this helps someone. EAH