First of all, both [name_f]Suzanne[/name_f] and [name_f]Susannah[/name_f] are beautiful names.
I looked up some of the variants of [name_f]Suzanne[/name_f] apart from [name_f]Shoshana[/name_f] in case any of them interest you: [name_f]Susan[/name_f], [name_f]Suzette[/name_f], [name_f]Susette[/name_f], [name_f]Sanne[/name_f], [name_f]Sanna[/name_f], [name_f]Zanne[/name_f], Zsuzana, Zsuzannah, [name_f]Shanna[/name_f], [name_f]Sosana[/name_f], [name_f]Susanka[/name_f], [name_f]Sosannah[/name_f], Sousana. I personally find some of them a bit out-there, but they might give you some inspiration as well. Another thing I looked into was nicknames or diminutives of [name_f]Suzanne[/name_f]. Although I would think some of these are only nicknames that doesn’t mean you couldn’t use them. Here’s the list: [name_f]Sue[/name_f], [name_f]Susie[/name_f], [name_f]Sosie[/name_f], [name_f]Sookie[/name_f], [name_f]Sukie[/name_f], [name_f]Sukey[/name_f], [name_u]Sunny[/name_u], Susa, [name_f]Sun[/name_f], [name_f]Sana[/name_f], [name_f]Hanna/name_f, [name_f]Anna[/name_f], [name_f]Anne[/name_f], [name_f]Nana[/name_f], [name_f]Nan[/name_f], [name_f]Zuzu[/name_f], Zsu Zsu. In fact, I think you could easily honor mother just with a nickname. Did she have any nicknames maybe?
[name_f]Savannah[/name_f] is a name that I just thought of sounded similar. You could also use the meaning of [name_f]Suzanne[/name_f] and Susuannah which is “lily”. I adore the name [name_f]Lily[/name_f], but if it’s too short there are many variants of this name as well: [name_f]Cecily[/name_f], [name_f]Delilah[/name_f], [name_f]Elisabeth[/name_f], [name_f]Emily[/name_f], [name_f]Lila[/name_f], [name_f]Lilac[/name_f], Lilana, [name_f]Lilas[/name_f], [name_f]Lilia[/name_f], [name_f]Liliana[/name_f], [name_f]Lilibeth[/name_f], [name_f]Lilike[/name_f], [name_f]Lilith[/name_f], [name_f]Liliosa[/name_f], [name_f]Lilium[/name_f], [name_f]Lillian[/name_f], [name_f]Lilo[/name_f], [name_f]Lilou[/name_f], [name_f]Romilly[/name_f], and [name_f]Sicily[/name_f].
I also found a really long list of female mathematicians and there is such a great variety of names there. Though some of the most famous female mathematicians include [name_f]Hypatia[/name_f] (I find this uniquely appealing), [name_f]Mary[/name_f] Somerville, [name_f]Florence[/name_f] Nightingale, [name_f]Maryam[/name_f] Mirzakhani ([name_f]Miriam[/name_f] maybe?), and [name_f]Sophie[/name_f] [name_m]Germain[/name_m] (or [name_f]Sophia[/name_f]).
As for space, there a so many astrological and space associated names. Britsh [name_u]Baby[/name_u] Names has a Astronomical Names list that I find very interesting. Other than that there is a thread on Nameberry as well that has lovely names: Celestial/space inspired names. [name_f]Hope[/name_f] this helps!