A Mysterious Morpheme *hi(N)

[Koontz John E]

Last night while trying to provide a good explanation of why Winnebago
kaNnaNk' 'to marry' would be more likely to be underlyingly |kraNk| than
|knak|, I noticed that Winnebago 'husband' is hikaNnaN'.  My initial
impression was that hi was just the usual Winnebago reflex of Px3 *i
'his/her' (probably 'her' here!).  But I also noticed that Ioway-Otoe has
hiNgra ~ igraN and that Teton has higna.  So it looks like the initial
morpheme here is *hi(N).  HuN?