I like your suggestion of Cronan Ian.
I initially thought the first vowel was an a because of the downstroke on the right of the letter, but I see in other examples of o such as in Bachelor, that also has the same downstroke to the right.
If location fits, it might be right.
I would also consider purchasing the Australian death certificate/s. No guarantees, but may be worth a gamble.
Who and when did Janet marry in Australia?
Added: Was it John McGregor in 1874?
Reason for asking was I thought there may be newspaper mentions of the family, obits (which often mention places of birth) etc, but with such common names may be an impossible task.
