(Aroace with two moms here) It wouldn’t strike me as odd at all! [name_m]Even[/name_m] if the baby was[name_f][/name_f] explicitly named for the band, I would probably find it more amusing/interesting than strange; like a “we named our child [name_f]Lennon[/name_f] / [name_m]Hendrix[/name_m] / [name_m]Jagger[/name_m] after our favourite singer” situation, if that makes sense?
[name_f][/name_f](Also, just like you, I’m not sure how well known [name_f]Tegan[/name_f] and [name_f]Sara[/name_f] actually are, but probably not ubiquitous enough that you would receive nonstop comments.)