I have a Frank (maybe Francis) IREMONGER who married into my family around the turn of the century. He was a basketmaker and probably from Devon. He married Winifred COMBES (born abt 1887 in Exeter, Devon) and they had a daughter Phyllis (DYER), granddaughter Pat, grandson Lesley. Winifred (I can't say whether Frank went too) moved to Johannesburg, South Africa sometime between the 1930s and 1960 (I met her in 1968 at her home in Jo'burg) and she died there sometime in the 1970s. The grandson Lesley died young of leukemia. Phyllis Dyer (née Iremonger)was still alive in August 1982 when I last saw her at her home in Jo'burg and had become a South African citizen. Pat DYER probably still lives there, although I don't know her married name or whether she had any children.
I hope this is useful to you. I am grateful for any info on these names, especially the RSA link.