[Opinions] Re: twins again! HELP!
Those are all nice names, and nice pairs! I think Jen and Liz go well with Ian, but I'd suggest using them as nicknames. Jen can be a nickname for a lot of names (Jennifer, Jane, any Jan- name, Genevieve, Geneva...) and Liz of course for Elizabeth.
Some more suggestions for you, since I missed your last thread:
Ian & Zoe
Ian & Kira
Ian & Phoebe
Ian & Lydia
Ian & Isobel
Ian & Alice
Ian & Bridget