Naming disagreements with MIL. Need opinions

Alright so this is on behalf my sister who needs an unbiased advice. Ok so I she 7 months pregnant due in September with first baby girl. She lives separately from her in laws. We just happen to stay over for a weekend and her MIL asked about what they would be naming her daughter. She said “Heaven Grace” along with her husbands last name and she suggested that they should name her something else because when she grows up, guys are gonna tease her like “take me to 7th heaven or show me what heaven looks like and all thy bullshit. Mind you when she got to know it’s a girl that was her 1st thought of the name. Her husband loves that name too but these people are adamant that they should think of something else. My sister is just overthinking about this situation and I have tried to explain to her how about how beautiful this name is. I would like your opinions about this so that I can show it to her. TIA ❤️